Finding the Third Proportional to 87,191.25 and 131,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,191.25 : 131,428.50 = 131,428.50 : x
2. Step 2: Convert to fraction form
   87,191.25/131,428.50 = 131,428.50/x
3. Step 3: Cross multiply
   87,191.25x = 131,428.50 × 131,428.50
4. Step 4: Simplify right side
   87,191.25x = 17,273,450,612.25
5. Step 5: Solve for x
   x = 17,273,450,612.25/87,191.25
6. Step 6: Final answer
   x = 198,109.91