Let's roll up our sleeves and solve this. We have 287 and we're going to multiply it by 4, essentially adding 287 to itself 4 times.
Step 1: 0 + 287 = 287
Step 2: 287 + 287 = 574
Step 3: 574 + 287 = 861
Step 4: 861 + 287 = 1148

So, 287*4 = 1148