Supplementary Angle 93287D

1. **State the problem:** We need to find the angle supplementary to $\angle 4$. 2. **Recall the definition:** Two angles are supplementary if the sum of their measures is $180^\circ$. 3. **Analyze the diagram description:** The angles $\angle 3$ and $\angle 4$ are adjacent and form a straight line (since they are part of the intersecting lines forming an X). 4. **Identify supplementary angle:** Since $\angle 3$ and $\angle 4$ are adjacent and on a straight line, they are supplementary. 5. **Conclusion:** The angle supplementary to $\angle 4$ is $\angle 3$. **Final answer:** $\boxed{\angle 3}$