Alright, let's work through 3892 times 2143 step by step
3892 × 2143 = 2143 × (3892)
+ 2143 × 2 which equals 4286
+ 2143 × 90 that is equal 192870
+ 2143 × 800 yielding 1714400
+ 2143 × 3000 producing 6429000

= 8340556
