Remember that the current forward rate is given by the equation:

$$F_t = S_t e^{-y_t e^{rt}}$$

We know that, $S_t = 1.22$, $r = 0.037$, $y = 0.0192$ and $\tau = 1$.

Applying the formula:

$$F_t = 1.22 e^{-0.0192 \times 1} \times e^{0.037 \times 1} = 1.24$$

The forward rate to but one unit of the underlying cash asset is 1.24