Propotional Fonts

I am using GRX with DJGPP. I am working on a routine for numerical input. I am using the helve15 font. The problem I have is that the width of a space character is less than a numerical character. When a leading space is replace by a number the displayed number does a right shift on the screen. Is there a way to cause a proportional width font to be printed in fixed width? I thought of using right justify but that would only work if I only had one leading space. I can make this come out correctly by displaying a character at a time but if GRX has a solution there is no point in me re inventing the wheel. Cheers Richard