Alright, let's work through 5205 times 3658 step by step
5205 × 3658 = 3658 × (5205)
+ 3658 × 5 giving us 18290
+ 3658 × 00 what gives us 0
+ 3658 × 200 that equals 731600
+ 3658 × 5000 yielding 18290000

= 19039890
