Need to align decimal without making a list or a table

Hi All,

I have a list of illustration in a table of contents. I do not want to put this list in a table nor do I want to make an actual list. But I do want the decimals to line up. I have tried creating a paragraph style to do this but it doesn't seem to work. I can easily put the tabs where I want but not the decimal point. This will be clear when you look at the screenshot. I want the decimal points to line up on the green guideline.

Thanks,

Tom