Alright, let's work through 5241 times 813 step by step
5241 × 813 = 813 × (5241)
+ 813 × 1 what gives us 813
+ 813 × 40 producing 32520
+ 813 × 200 that results in 162600
+ 813 × 5000 what gives us 4065000

= 4260933
