Alright, let's work through 54238757 times 91789940 step by step
54238757 × 91789940 = 91789940 × (54238757)
+ 91789940 × 7 which equals 642529580
+ 91789940 × 50 which equals 4589497000
+ 91789940 × 700 that is equal 64252958000
+ 91789940 × 8000 producing 734319520000
+ 91789940 × 30000 yielding 2753698200000
+ 91789940 × 200000 resulting in 18357988000000
+ 91789940 × 4000000 that results in 367159760000000
+ 91789940 × 50000000 that equals 4589497000000000

= 4978572250704580
