Finding the Third Proportional to 71,321 and 99,707

Step by Step Solution

1. Step 1: Write the proportion equation
   71,321 : 99,707 = 99,707 : x
2. Step 2: Convert to fraction form
   71,321/99,707 = 99,707/x
3. Step 3: Cross multiply
   71,321x = 99,707 × 99,707
4. Step 4: Simplify right side
   71,321x = 9,941,485,849
5. Step 5: Solve for x
   x = 9,941,485,849/71,321
6. Step 6: Final answer
   x = 139,390.72