No problem, we've got 9884 and 7915 to multiply
9884 × 7915 = 7915 × (9884)
+ 7915 × 4 which equals 31660
+ 7915 × 80 giving us 633200
+ 7915 × 800 resulting in 6332000
+ 7915 × 9000 resulting in 71235000

= 78231860
