Alright, let's work through 7864 times 2916 step by step
7864 × 2916 = 2916 × (7864)
+ 2916 × 4 resulting in 11664
+ 2916 × 60 resulting in 174960
+ 2916 × 800 resulting in 2332800
+ 2916 × 7000 resulting in 20412000

= 22931424
