Portal Row by Calculation

[mcinfly]

How do I write a calculation to be used in the script step "Go to Portal Row (By calculation)" that would take me to the portal row with the highest ID number?

My portal is sorted by a text field (Company), so when I add a new portal row, depending on the name of the new company, the new portal row may be row #2 or #5 or...you get the idea (meaning I can't have the script go to the first, last or next row. It must be a calculation).

Since the ID#'s are generated automatically and are unique, I need to find a way, via calculation, of going to the portal row with the highest ID#, which would be the new one just added.

Thanks for any help!