Take every other digit and double them starting with the first digit and put plus signs between them. We have:
4901 0947 7301 872x
After doubling we get
8+9+0+1 + 0+9+8+7 + 14+3+0+1 + 16+7+2+x
4901 0947 7301 872x
After doubling we get
8+9+0+1 + 0+9+8+7 + 14+3+0+1 + 16+7+2+x