Alright, let's work through 5902 times 7243 step by step
5902 × 7243 = 7243 × (5902)
+ 7243 × 2 yielding 14486
+ 7243 × 00 producing 0
+ 7243 × 900 resulting in 6518700
+ 7243 × 5000 giving us 36215000

= 42748186
