Finding the Third Proportional to 9,992 and 20,686

Step by Step Solution

1. Step 1: Write the proportion equation
   9,992 : 20,686 = 20,686 : x
2. Step 2: Convert to fraction form
   9,992/20,686 = 20,686/x
3. Step 3: Cross multiply
   9,992x = 20,686 × 20,686
4. Step 4: Simplify right side
   9,992x = 427,910,596
5. Step 5: Solve for x
   x = 427,910,596/9,992
6. Step 6: Final answer
   x = 42,825.32