<t>As Marmalade has said, you have to start with an assumed 3-year df, adopt an arbitrary interpolation scheme of some sort to work out the df at 0.5, 1, 1.5, 2, 2.5 from the 3-year df, compute the NPV of the swap, then use some kind of "goal seek" or "solver" to arrive at zero value for the swap. G...