Alright, let's work through 4309 times 4239 step by step
4309 × 4239 = 4239 × (4309)
+ 4239 × 9 producing 38151
+ 4239 × 00 yielding 0
+ 4239 × 300 that equals 1271700
+ 4239 × 4000 that equals 16956000

= 18265851
