I think there may be a bug in the rounding to 3 places, it seems that it rounds to 2 places. Here is my little test program that shows it. It may be I'm doing something wrong too.
$55 = 55.18975647547689 $rten = Round($55,0) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,1) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,2) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,3) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,4) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,5) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,6) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,7) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,8) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,9) Print($rten)
$55 = 55.18975647547689 $rten = Round($55,10) Print($rten)
55.18975647547689 to 3dp is 55.190 which is 55.19 as the last 0 isn't required and therefore not printed.
Try it with 1.23456789 and you'll see Round($x,3) works.
Oh I see, I guess I was thinking truncate instead. Duh. Thanks Rich