Alright, let's work through 3864 times 2705 step by step
3864 × 2705 = 2705 × (3864)
+ 2705 × 4 producing 10820
+ 2705 × 60 that is equal 162300
+ 2705 × 800 that equals 2164000
+ 2705 × 3000 that is equal 8115000

= 10452120
