Finding the Third Proportional to 71,288 and 99,661

Step by Step Solution

1. Step 1: Write the proportion equation
   71,288 : 99,661 = 99,661 : x
2. Step 2: Convert to fraction form
   71,288/99,661 = 99,661/x
3. Step 3: Cross multiply
   71,288x = 99,661 × 99,661
4. Step 4: Simplify right side
   71,288x = 9,932,314,921
5. Step 5: Solve for x
   x = 9,932,314,921/71,288
6. Step 6: Final answer
   x = 139,326.60