Finding the Third Proportional to 71,286.75 and 99,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71,286.75 : 99,661.50 = 99,661.50 : x
2. Step 2: Convert to fraction form
   71,286.75/99,661.50 = 99,661.50/x
3. Step 3: Cross multiply
   71,286.75x = 99,661.50 × 99,661.50
4. Step 4: Simplify right side
   71,286.75x = 9,932,414,582.25
5. Step 5: Solve for x
   x = 9,932,414,582.25/71,286.75
6. Step 6: Final answer
   x = 139,330.44