Finding the Third Proportional to 71,291.25 and 99,672.75

Step by Step Solution

1. Step 1: Write the proportion equation
   71,291.25 : 99,672.75 = 99,672.75 : x
2. Step 2: Convert to fraction form
   71,291.25/99,672.75 = 99,672.75/x
3. Step 3: Cross multiply
   71,291.25x = 99,672.75 × 99,672.75
4. Step 4: Simplify right side
   71,291.25x = 9,934,657,092.56
5. Step 5: Solve for x
   x = 9,934,657,092.56/71,291.25
6. Step 6: Final answer
   x = 139,353.11