Let's say you have 3 services a weekend (8:30am, 10am, 11:30am).

Last weekend, you had a total of 300 in attendance (100, 100, 100).

This weekend at your 8:30am service you record 125. That's a 25% increase. The app is going to project that same % increase across the remaining services and the total. The total projection will be 375 (125 + 125 projected + 125 projected).

At your 10am service you record 100. The app updates the projection for the remaining 11:30am service. 125+100 is a 12.5% increase over the previous week of 100+100. The average increase is 12.5% so the new projected total would be 337 (125 + 100 + 112 projected).