I have a load of data that consists of websites and the "power" of their backlinks. The lowest power is 1. The highest is 949876. The average is 6056.
I want to be able to assign a site a ranking from 1-100 that denotes how powerful they are. I thought I could do this using a nice graph like this one (It's supposed to be a smooth curve ;-) http://i.stack.imgur.com/0fIRa.png
So, on the $x$-axis I have values from $0$ to $100$. I know the following points: $$x = 1, y = 1$$ $$x = 50, y = 6056$$ $$x = 100, y = 949876$$
How can I find $y$ for another value of $x$? .. or am I approaching this in totally the wrong way?