Finding the Third Proportional to 87,320 and 128,104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,320 : 128,104.50 = 128,104.50 : x
2. Step 2: Convert to fraction form
   87,320/128,104.50 = 128,104.50/x
3. Step 3: Cross multiply
   87,320x = 128,104.50 × 128,104.50
4. Step 4: Simplify right side
   87,320x = 16,410,762,920.25
5. Step 5: Solve for x
   x = 16,410,762,920.25/87,320
6. Step 6: Final answer
   x = 187,938.19