Finding the Third Proportional to 31,389 and 67,098

Step by Step Solution

1. Step 1: Write the proportion equation
   31,389 : 67,098 = 67,098 : x
2. Step 2: Convert to fraction form
   31,389/67,098 = 67,098/x
3. Step 3: Cross multiply
   31,389x = 67,098 × 67,098
4. Step 4: Simplify right side
   31,389x = 4,502,141,604
5. Step 5: Solve for x
   x = 4,502,141,604/31,389
6. Step 6: Final answer
   x = 143,430.55