The ornamental design for a mounting apparatus for a portable electronic device, as shown and described.
FIG. 1 is a perspective view showing the front and upper surface of a mounting apparatus according to the present design.
FIG. 2 is a front view of the mounting apparatus.
FIG. 3 is a rear view of the mounting apparatus.
FIG. 4 is a left side view of the mounting apparatus.
FIG. 5 is a right side view of the mounting apparatus.
FIG. 6 is a top view of the mounting apparatus; and,
FIG. 7 is a bottom view of the mounting apparatus.
The broken lines, which show a mounting apparatus for a portable electronic device, are for the purpose of illustrating portions of the article or environmental structure and form no part of the claimed design.