Finding the Third Proportional to 66,616 and 86,427.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,616 : 86,427.50 = 86,427.50 : x
2. Step 2: Convert to fraction form
   66,616/86,427.50 = 86,427.50/x
3. Step 3: Cross multiply
   66,616x = 86,427.50 × 86,427.50
4. Step 4: Simplify right side
   66,616x = 7,469,712,756.25
5. Step 5: Solve for x
   x = 7,469,712,756.25/66,616
6. Step 6: Final answer
   x = 112,130.91