Finding the Third Proportional to 81,336 and 129,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,336 : 129,870.50 = 129,870.50 : x
2. Step 2: Convert to fraction form
   81,336/129,870.50 = 129,870.50/x
3. Step 3: Cross multiply
   81,336x = 129,870.50 × 129,870.50
4. Step 4: Simplify right side
   81,336x = 16,866,346,770.25
5. Step 5: Solve for x
   x = 16,866,346,770.25/81,336
6. Step 6: Final answer
   x = 207,366.32