Finding the Third Proportional to 21,638 and 31,605

Step by Step Solution

1. Step 1: Write the proportion equation
   21,638 : 31,605 = 31,605 : x
2. Step 2: Convert to fraction form
   21,638/31,605 = 31,605/x
3. Step 3: Cross multiply
   21,638x = 31,605 × 31,605
4. Step 4: Simplify right side
   21,638x = 998,876,025
5. Step 5: Solve for x
   x = 998,876,025/21,638
6. Step 6: Final answer
   x = 46,163.05