Alright, let's work through 4240 times 6722 step by step
4240 × 6722 = 6722 × (4240)
+ 6722 × 0 producing 0
+ 6722 × 40 what gives us 268880
+ 6722 × 200 what gives us 1344400
+ 6722 × 4000 that equals 26888000

= 28501280
