Alright, let's work through 8391 times 1360 step by step
8391 × 1360 = 1360 × (8391)
+ 1360 × 1 that equals 1360
+ 1360 × 90 yielding 122400
+ 1360 × 300 that equals 408000
+ 1360 × 8000 which equals 10880000

= 11411760
