Finding the Third Proportional to 81,258 and 129,757.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,258 : 129,757.50 = 129,757.50 : x
2. Step 2: Convert to fraction form
   81,258/129,757.50 = 129,757.50/x
3. Step 3: Cross multiply
   81,258x = 129,757.50 × 129,757.50
4. Step 4: Simplify right side
   81,258x = 16,837,008,806.25
5. Step 5: Solve for x
   x = 16,837,008,806.25/81,258
6. Step 6: Final answer
   x = 207,204.32