Alright, let's work through 3911 times 2160 step by step
3911 × 2160 = 2160 × (3911)
+ 2160 × 1 which equals 2160
+ 2160 × 10 producing 21600
+ 2160 × 900 that results in 1944000
+ 2160 × 3000 what gives us 6480000

= 8447760
