Finding the Third Proportional to 131,988 and 212,509.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,988 : 212,509.50 = 212,509.50 : x
2. Step 2: Convert to fraction form
   131,988/212,509.50 = 212,509.50/x
3. Step 3: Cross multiply
   131,988x = 212,509.50 × 212,509.50
4. Step 4: Simplify right side
   131,988x = 45,160,287,590.25
5. Step 5: Solve for x
   x = 45,160,287,590.25/131,988
6. Step 6: Final answer
   x = 342,154.50