Finding the Third Proportional to 31,707 and 69,687

Step by Step Solution

1. Step 1: Write the proportion equation
   31,707 : 69,687 = 69,687 : x
2. Step 2: Convert to fraction form
   31,707/69,687 = 69,687/x
3. Step 3: Cross multiply
   31,707x = 69,687 × 69,687
4. Step 4: Simplify right side
   31,707x = 4,856,277,969
5. Step 5: Solve for x
   x = 4,856,277,969/31,707
6. Step 6: Final answer
   x = 153,161.07