Finding unknown X value from known Y value from curve of best fit

Dear all, I am a novice when it comes to escel, I have managed to draw a line graph containing a line of best curve. I now need to find many 'unknown' y values, by putting in the known x axis coordinates. The formula that excel has put in my chart is this: y = 12.405e0.1162x. I dont know what do with it!
I have attached the file and would be grateful if somebody can help.

Thank you