Hopefully others here will have a 'proper' answer, but when I came across this problem before, I cheated.
I discarded numbered lists and went for a table instead. I hid all the table borders and cell borders, made the 1st column, (the left most column), wide enough for 3 digits, left justified it, then used the right hand column for all the text entries.
Since I was only using it as a presentation document, when it printed it looked fine.
Mark
When I hit a hundred in my list the space between the number and the sentence increases. How do I format so that from 100 onward the formatting matches number 1-99?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic