Finding the Third Proportional to 87,320 and 131,490

Step by Step Solution

1. Step 1: Write the proportion equation
   87,320 : 131,490 = 131,490 : x
2. Step 2: Convert to fraction form
   87,320/131,490 = 131,490/x
3. Step 3: Cross multiply
   87,320x = 131,490 × 131,490
4. Step 4: Simplify right side
   87,320x = 17,289,620,100
5. Step 5: Solve for x
   x = 17,289,620,100/87,320
6. Step 6: Final answer
   x = 198,002.98