Finding the Third Proportional to 9,908 and 20,517

Step by Step Solution

1. Step 1: Write the proportion equation
   9,908 : 20,517 = 20,517 : x
2. Step 2: Convert to fraction form
   9,908/20,517 = 20,517/x
3. Step 3: Cross multiply
   9,908x = 20,517 × 20,517
4. Step 4: Simplify right side
   9,908x = 420,947,289
5. Step 5: Solve for x
   x = 420,947,289/9,908
6. Step 6: Final answer
   x = 42,485.60