Alright, let's work through 4427 times 1840 step by step
4427 × 1840 = 1840 × (4427)
+ 1840 × 7 resulting in 12880
+ 1840 × 20 that is equal 36800
+ 1840 × 400 that equals 736000
+ 1840 × 4000 producing 7360000

= 8145680
