Alright, let's work through 1905 times 4287 step by step
1905 × 4287 = 4287 × (1905)
+ 4287 × 5 what gives us 21435
+ 4287 × 00 that is equal 0
+ 4287 × 900 that equals 3858300
+ 4287 × 1000 that is equal 4287000

= 8166735
