Finding the Third Proportional to 10,686 and 21,900

Step by Step Solution

1. Step 1: Write the proportion equation
   10,686 : 21,900 = 21,900 : x
2. Step 2: Convert to fraction form
   10,686/21,900 = 21,900/x
3. Step 3: Cross multiply
   10,686x = 21,900 × 21,900
4. Step 4: Simplify right side
   10,686x = 479,610,000
5. Step 5: Solve for x
   x = 479,610,000/10,686
6. Step 6: Final answer
   x = 44,882.09