Finding the Third Proportional to 61,069.50 and 128,700

Step by Step Solution

1. Step 1: Write the proportion equation
   61,069.50 : 128,700 = 128,700 : x
2. Step 2: Convert to fraction form
   61,069.50/128,700 = 128,700/x
3. Step 3: Cross multiply
   61,069.50x = 128,700 × 128,700
4. Step 4: Simplify right side
   61,069.50x = 16,563,690,000
5. Step 5: Solve for x
   x = 16,563,690,000/61,069.50
6. Step 6: Final answer
   x = 271,226.88