Interest rate swap problem

*An interest rate swap is based on the yield curve given below.*

*The fixed payment swap rate is R=0.4936. Find the 3-year spot rate x.*

I'm having trouble solving for x. For some reason I keep getting a negative number. This is what I've been doing.

From there

Which isn't correct. The book shows

Can someone point my mistake out please? Thanks

Re: Interest rate swap problem

You should use use .04936 as swap rate (kick yourself!).

Also, your 2.77725.... is not quite right: I get 2.71813...