To solve this reasoning question, we need to identify the pattern or sequence in the given figure series. Let's analyze the figures closely:

1. Observe the sequence: X, T, M, R, and a question mark. Notice that each figure is a triangle with a specific direction and shading.
2. Check the shading pattern and orientation:
   • Figure X: The triangle is pointing upwards with the left half shaded.
   • Figure T: The triangle is pointing to the right with the lower half shaded.
   • Figure M: The triangle is pointing upwards with the right half shaded.
   • Figure R: The triangle is pointing to the right with the upper half shaded.
3. From the above observations, there's a repeating pattern:
   • The direction alternates: up, right, up, right.
   • The shading also alternates systematically, shifting between halves for each orientation.
4. Therefore, the next figure should follow the pattern by maintaining the direction right and shading alignment:
   • The figure should be an upward triangle with the left shaded half, similar to Figure X.

Based on these observations, the correct figure to fill the question mark must match these patterns and orientation.

Thus, the solution is: