Finding the Third Proportional to 88,142 and 128,520.75

Step by Step Solution

1. Step 1: Write the proportion equation
   88,142 : 128,520.75 = 128,520.75 : x
2. Step 2: Convert to fraction form
   88,142/128,520.75 = 128,520.75/x
3. Step 3: Cross multiply
   88,142x = 128,520.75 × 128,520.75
4. Step 4: Simplify right side
   88,142x = 16,517,583,180.56
5. Step 5: Solve for x
   x = 16,517,583,180.56/88,142
6. Step 6: Final answer
   x = 187,397.42