Finding the Third Proportional to 10,040 and 20,687

Step by Step Solution

1. Step 1: Write the proportion equation
   10,040 : 20,687 = 20,687 : x
2. Step 2: Convert to fraction form
   10,040/20,687 = 20,687/x
3. Step 3: Cross multiply
   10,040x = 20,687 × 20,687
4. Step 4: Simplify right side
   10,040x = 427,951,969
5. Step 5: Solve for x
   x = 427,951,969/10,040
6. Step 6: Final answer
   x = 42,624.70