I have four values, and I have to put them in summation notation. It would be appreciated if someone could help me, thanks!

0.00391

0.0352

0.00977

0.191

I guess it would help converting them into fractions at first, but I don't seem to know where to move on from there because I can't seem to find a pattern between the four values. Your help would greatly be appreciated.

Thanks,

Sam