Alright, let's work through 9191 times 7815 step by step
9191 × 7815 = 7815 × (9191)
+ 7815 × 1 which equals 7815
+ 7815 × 90 yielding 703350
+ 7815 × 100 that equals 781500
+ 7815 × 9000 yielding 70335000

= 71827665
