Finding the Third Proportional to 131,387.50 and 288,208.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,387.50 : 288,208.50 = 288,208.50 : x
2. Step 2: Convert to fraction form
   131,387.50/288,208.50 = 288,208.50/x
3. Step 3: Cross multiply
   131,387.50x = 288,208.50 × 288,208.50
4. Step 4: Simplify right side
   131,387.50x = 83,064,139,472.25
5. Step 5: Solve for x
   x = 83,064,139,472.25/131,387.50
6. Step 6: Final answer
   x = 632,207.32