Based on the number of shares you inherited--900 shares--and the cost basis per share--$28.098--you may have a small realized loss from the fractional share, less than $5.00. Below is a link to AT&T's Investor Cost Basis Guide all of which relates to the questions you have raised. Near the bottom of the screen is a fairly straightforward calculator where you can enter the numbers you have provided in your post and arrive at the basis for the fractional share.
Investors Cost Basis Guide
@angelv17
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