declare @v varchar(30)
,@f float

    -- here you think it is all right and it is
    set @f = 1.12
    set @v = @f
    select @v
    
    -- here you think it is all right, but you get the wrong result
    set @f = 123456.12
    set @v = @f
    select @v    
    
    -- worst and worst
    set @f = 12345677.12
    set @v = @f
    select @v        
    
    -- correct solution
    set @f = 12345677.12
    set @v = CAST(@f AS DECIMAL(16,2))
    select @v