Final answer:
The area of the base of the tree fort is 7176 square inches.
Step-by-step explanation:
To find the area of the base of the tree fort, you need to multiply the width by the length. The width is 78 inches and the length is 92 inches.
So, the area of the base can be calculated as:
Area = Width x Length
Area = 78 inches x 92 inches
Area = 7176 square inches
Therefore, the area of the base of the tree fort is 7176 square inches.