The ornamental design for a seating apparatus, as shown and described.
FIG. 1 is a perspective view of a seating apparatus including my new design as implemented in conjunction with a quadricycle, whereby the dashed lines form no part of the claimed design;
FIG. 2 is a perspective view of the seating apparatus showing my new design;
FIG. 3 is a perspective view of the seating apparatus including hand grips, seat cushions and an end cap, whereby the dashed lines of the hand grips, seat cushions and end cap form no part of the claimed design;
FIG. 4 is a right side elevational view of the seating apparatus;
FIG. 5 is a left side elevational view of the seating apparatus;
FIG. 6 is a front elevational view of the seating apparatus;
FIG. 7 is a rear elevational view of the seating apparatus;
FIG. 8 is a top view of the seating apparatus; and,