Finding the Third Proportional to 60,715.50 and 128,830

Step by Step Solution

1. Step 1: Write the proportion equation
   60,715.50 : 128,830 = 128,830 : x
2. Step 2: Convert to fraction form
   60,715.50/128,830 = 128,830/x
3. Step 3: Cross multiply
   60,715.50x = 128,830 × 128,830
4. Step 4: Simplify right side
   60,715.50x = 16,597,168,900
5. Step 5: Solve for x
   x = 16,597,168,900/60,715.50
6. Step 6: Final answer
   x = 273,359.67