Finding the Third Proportional to 87,405 and 131,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,405 : 131,059.50 = 131,059.50 : x
2. Step 2: Convert to fraction form
   87,405/131,059.50 = 131,059.50/x
3. Step 3: Cross multiply
   87,405x = 131,059.50 × 131,059.50
4. Step 4: Simplify right side
   87,405x = 17,176,592,540.25
5. Step 5: Solve for x
   x = 17,176,592,540.25/87,405
6. Step 6: Final answer
   x = 196,517.28