Finding the Third Proportional to 10,978 and 16,687

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978 : 16,687 = 16,687 : x
2. Step 2: Convert to fraction form
   10,978/16,687 = 16,687/x
3. Step 3: Cross multiply
   10,978x = 16,687 × 16,687
4. Step 4: Simplify right side
   10,978x = 278,455,969
5. Step 5: Solve for x
   x = 278,455,969/10,978
6. Step 6: Final answer
   x = 25,364.91