Finding the Third Proportional to 31,717 and 69,711

Step by Step Solution

1. Step 1: Write the proportion equation
   31,717 : 69,711 = 69,711 : x
2. Step 2: Convert to fraction form
   31,717/69,711 = 69,711/x
3. Step 3: Cross multiply
   31,717x = 69,711 × 69,711
4. Step 4: Simplify right side
   31,717x = 4,859,623,521
5. Step 5: Solve for x
   x = 4,859,623,521/31,717
6. Step 6: Final answer
   x = 153,218.26