Alright, let's work through 3805 times 2289 step by step
3805 × 2289 = 2289 × (3805)
+ 2289 × 5 yielding 11445
+ 2289 × 00 what gives us 0
+ 2289 × 800 that is equal 1831200
+ 2289 × 3000 resulting in 6867000

= 8709645
