Finding the Third Proportional to 21,019 and 31,687

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019 : 31,687 = 31,687 : x
2. Step 2: Convert to fraction form
   21,019/31,687 = 31,687/x
3. Step 3: Cross multiply
   21,019x = 31,687 × 31,687
4. Step 4: Simplify right side
   21,019x = 1,004,065,969
5. Step 5: Solve for x
   x = 1,004,065,969/21,019
6. Step 6: Final answer
   x = 47,769.45