Finding the Third Proportional to 21,016 and 31,686

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016 : 31,686 = 31,686 : x
2. Step 2: Convert to fraction form
   21,016/31,686 = 31,686/x
3. Step 3: Cross multiply
   21,016x = 31,686 × 31,686
4. Step 4: Simplify right side
   21,016x = 1,004,002,596
5. Step 5: Solve for x
   x = 1,004,002,596/21,016
6. Step 6: Final answer
   x = 47,773.25