Finding the Third Proportional to 87,540.50 and 128,205.50

Step by Step Solution

1. Step 1: Write the proportion equation
   87,540.50 : 128,205.50 = 128,205.50 : x
2. Step 2: Convert to fraction form
   87,540.50/128,205.50 = 128,205.50/x
3. Step 3: Cross multiply
   87,540.50x = 128,205.50 × 128,205.50
4. Step 4: Simplify right side
   87,540.50x = 16,436,650,230.25
5. Step 5: Solve for x
   x = 16,436,650,230.25/87,540.50
6. Step 6: Final answer
   x = 187,760.52