In layout mode, select the field>right click>choose 'text format'>choose 'paragraph'>and select right justification. (Assuming working on a PC)
With a Mac, select the field and format it from the dropdown menus to accomplish the same thing.
Note that this will affect the layout and all of your views of that layout, not just table view. If you want it centered in list view, but right-justified in table view, you might want to consider different layouts for the two views.
Does this work for you?
Thanks for the explanation. A bit counter-intuitive, coming from Bento, but I can make it work.
An easier way is to go into Layout mode, click on the Number field, pull down the Format menu and select "Align Text -> Right".