Finding the Third Proportional to 131,388 and 288,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,388 : 288,209.50 = 288,209.50 : x
2. Step 2: Convert to fraction form
   131,388/288,209.50 = 288,209.50/x
3. Step 3: Cross multiply
   131,388x = 288,209.50 × 288,209.50
4. Step 4: Simplify right side
   131,388x = 83,064,715,890.25
5. Step 5: Solve for x
   x = 83,064,715,890.25/131,388
6. Step 6: Final answer
   x = 632,209.30