What number comes next 3 10 30 47?

I m not sure but I think it could be 77?

1) 3 2) 10 3) 30 4) 47 5) ?

Between 1 and 3 there is a difference of 27 (3+27=30)

Between 2 and 4 there is a difference of 37 (10+37=47)

Between 3 and 5 it could be a difference of 47 (30+47=77)