Finding the Third Proportional to 61,438.50 and 129,060

Step by Step Solution

1. Step 1: Write the proportion equation
   61,438.50 : 129,060 = 129,060 : x
2. Step 2: Convert to fraction form
   61,438.50/129,060 = 129,060/x
3. Step 3: Cross multiply
   61,438.50x = 129,060 × 129,060
4. Step 4: Simplify right side
   61,438.50x = 16,656,483,600
5. Step 5: Solve for x
   x = 16,656,483,600/61,438.50
6. Step 6: Final answer
   x = 271,108.24