Finding the Third Proportional to 87,542.50 and 128,208

Step by Step Solution

1. Step 1: Write the proportion equation
   87,542.50 : 128,208 = 128,208 : x
2. Step 2: Convert to fraction form
   87,542.50/128,208 = 128,208/x
3. Step 3: Cross multiply
   87,542.50x = 128,208 × 128,208
4. Step 4: Simplify right side
   87,542.50x = 16,437,291,264
5. Step 5: Solve for x
   x = 16,437,291,264/87,542.50
6. Step 6: Final answer
   x = 187,763.56