Finding the Third Proportional to 59,685.38 and 128,710.50

Step by Step Solution

1. Step 1: Write the proportion equation
   59,685.38 : 128,710.50 = 128,710.50 : x
2. Step 2: Convert to fraction form
   59,685.38/128,710.50 = 128,710.50/x
3. Step 3: Cross multiply
   59,685.38x = 128,710.50 × 128,710.50
4. Step 4: Simplify right side
   59,685.38x = 16,566,392,810.25
5. Step 5: Solve for x
   x = 16,566,392,810.25/59,685.38
6. Step 6: Final answer
   x = 277,562.01