My thinking would be that one would add a new 5 to any remaining divisor whenever a profit is not made in any 10 bet sequence.
i.e 10 bets havent cleared the target add a new 5 .
1st 10 bets havent cleared the target add another 5 .
If at 30 bets still havent cleared the original target add another 5.

The main thing with Target betting is that the bank should be 40 times the amount you want to win over 10 bets.
i.e Target over 10 bets = $100 /Bank required $4000

Cheers
darky