Finding the Third Proportional to 21,021 and 31,690

Step by Step Solution

1. Step 1: Write the proportion equation
   21,021 : 31,690 = 31,690 : x
2. Step 2: Convert to fraction form
   21,021/31,690 = 31,690/x
3. Step 3: Cross multiply
   21,021x = 31,690 × 31,690
4. Step 4: Simplify right side
   21,021x = 1,004,256,100
5. Step 5: Solve for x
   x = 1,004,256,100/21,021
6. Step 6: Final answer
   x = 47,773.95