Finding the Third Proportional to 71,278.50 and 99,651.75

Step by Step Solution

1. Step 1: Write the proportion equation
   71,278.50 : 99,651.75 = 99,651.75 : x
2. Step 2: Convert to fraction form
   71,278.50/99,651.75 = 99,651.75/x
3. Step 3: Cross multiply
   71,278.50x = 99,651.75 × 99,651.75
4. Step 4: Simplify right side
   71,278.50x = 9,930,471,278.06
5. Step 5: Solve for x
   x = 9,930,471,278.06/71,278.50
6. Step 6: Final answer
   x = 139,319.31