Finding the Third Proportional to 59,251.50 and 129,979.69

Step by Step Solution

1. Step 1: Write the proportion equation
   59,251.50 : 129,979.69 = 129,979.69 : x
2. Step 2: Convert to fraction form
   59,251.50/129,979.69 = 129,979.69/x
3. Step 3: Cross multiply
   59,251.50x = 129,979.69 × 129,979.69
4. Step 4: Simplify right side
   59,251.50x = 16,894,719,162.60
5. Step 5: Solve for x
   x = 16,894,719,162.60/59,251.50
6. Step 6: Final answer
   x = 285,135.72