Adjustable Portable Platform

FIG. 1 is a top perspective view of an adjustable portable platform showing my new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front elevation view thereof, the rear elevation view being a mirror image of the front elevation view; FIG. 4 is a right elevation view thereof, the left elevation view being a mirror image of the right elevation view; FIG. 5 is a top elevation view thereof; and, FIG. 6 is a bottom elevation view thereof. The even spaced dash-dash broken lines shown in the drawings depict portions of the article that form no part of the claimed design. The uneven spaced dot-dash broken lines shown in the drawings depict the bounds of the article that form no part of the claimed design.