Finding the Third Proportional to 80,800.50 and 138,940.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,800.50 : 138,940.50 = 138,940.50 : x
2. Step 2: Convert to fraction form
   80,800.50/138,940.50 = 138,940.50/x
3. Step 3: Cross multiply
   80,800.50x = 138,940.50 × 138,940.50
4. Step 4: Simplify right side
   80,800.50x = 19,304,462,540.25
5. Step 5: Solve for x
   x = 19,304,462,540.25/80,800.50
6. Step 6: Final answer
   x = 238,915.14