Running Total and Grand Total

I have a report which has 3 running totals for three columns and a running total for a column which begins at the group level.

I need to print a Grand Total which shows the 4 running totals added together. Can anyone please tell me how to do this?

Detail - 1 0 0

detail - 0 29 0

detail - 0 0 24

subtotal 1 29 24 3.25

total 1 29 24 3.25 grand total 57.25

Thanks-

Mickey