Alright, let's work through 5902 times 4906 step by step
5902 × 4906 = 4906 × (5902)
+ 4906 × 2 what gives us 9812
+ 4906 × 00 producing 0
+ 4906 × 900 producing 4415400
+ 4906 × 5000 which equals 24530000

= 28955212
