What's the payout on a reverse forecast - is it a multiple of the straight forecast dividend?

Example - I'm paper trading something that put up a RF yesteday that came in with a winner at 4/5 and second at 15/8. The straight forecast dividend was 2.67. What's the RF payout?

Still a little ignorant in these areas, despite being around here for a while. Perhaps some of you pro bods can help.