Ray is right. You would be getting 44.9 rather than 44.8

Start with this.

select ROUND(44.8730084,1) -- gives 44.9000000 as output

Or try this way.

declare @val float;

set @val = 44.8730084

select ROUND(@val,1,1) -- gives 44.8 as output

select ROUND(@val,1,0) -- gives 44.9 as output