Should you use a comma after a number that falls at the end of a clause, even if the number has commas in it (ex: 1,000,000)?

Question

For example, in the sentence

The cost is anticipated to be $1,000,000, inclusive of pre-construction costs.

is it appropriate to use a comma after $1,000,000 or should a semicolon be used?

Answer 1

The comma is fine there. (A semicolon would be ungrammatical.) It's just a matter of preference.

If you wished, you could reverse the sentence so that the dependent clause comes first:

Inclusive of pre-construction costs, the cost is anticipated to be $1,000,000.

However, that draws attention to the repetitive use of cost.

To address that, you could make another change:

Including pre-construction, the cost is anticipated to be $1,000,000.

Or simply:

The total cost is anticipated to be $1,000,000.

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You could also leave the structure of the sentence as is but not use a numeral:

The cost is anticipated to be a million dollars, inclusive of pre-construction costs.
The cost is anticipated to be a million dollars, including pre-construction.
The total cost is anticipated to be a million dollars.

Answer 2

The only possible reason to not put punctuation next to a number is if the punctuation could introduce confusion about the number's value. For example, if you put a hyphen before a number, it would look like the number's negative.

But there's no way that could happen with a comma, so your sentence is fine.

Answer 3

A semicolon is often preferred, but the choice is a matter of style. Here is an example of semicolon use as a separator with large numbers. It is from a popular style guide. It also happens to be the part that tells you to write-out one million dollars.

The Chicago Manual of Style recommends spelling out the numbers zero through one hundred and using figures thereafter—except for whole numbers used in combination with hundred, thousand, hundred thousand, million, billion, and beyond (e.g., two hundred; twenty-eight thousand; three hundred thousand; one million). In Chicago style, as opposed to AP style, we would write four hundred, eight thousand, and twenty million with no numerals—but like AP, Chicago style would require numerals for 401; 8,012; and 20,040,086.

There are other examples nearby in the text.

From The Grammar Book - https://www.grammarbook.com/numbers/numbers.asp