"Table Report" row total

Here is one I can't figure out.  I have a "Table" report that has multiple sales columns from multiple datasets.  Column 1 has the product description from the master product file dataset; column 2 shows the sales total for each product from dataset A; column 3 shows the sales total for each product from dataset B, etc.  My question is, how can I get a column on the far right of the report that has the total for each row (total each product from all sales datasets)?  This report is filtering transactions based on date which is set up as a separate dataset.  Any help would be appreciated.