sql query Convert method

This sql statement returns a whole number, like:

1, 7, 14

I want it to return a number like:

1.0.0
7.0.0
14.0.0

CONVERT(varchar(10), ISNULL(etw.Listorder, 99)) as 'ListOrder3'

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How would I alter it? Currently what I've tried gives errors pertaining to it not being an integer value.

thanks!