Determine the current i through the 4 ohm resistor
When you short the right source you end up with this circuit:







simulate this circuit &ndash; Schematic created using CircuitLab

So in order to obtain the voltage across the resistor you have to take into account the second inductor.

$$
Vr=3∠0°*\frac{R1||L2}{L1 + R1||L2}
$$
R1||L2 means the parallel of Resistor 1 and Inductor 2
$$
R1||L2 = \frac{R1· j \omega L2}{R+ j \omega L2}
$$

Also you have to apply superposition shorting the left source and then adding the two results.