The diagram. Draw a square with triangles to left and right attached to it. The side of the square plus the equal altitudes of the triangle is 7 ft. The side of the square is the width of the pedestal 4 ft.
The altitude of each triangle is (7-4)/2=3/2, the base is 4. The total area if the pedestal is 4×4=16 for the square part and 4×3/2=6 for the two triangles (each has base 4 altitude 3/2). The total area is 22 ft²