Finding the Third Proportional to 9,900 and 20,617

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900 : 20,617 = 20,617 : x
2. Step 2: Convert to fraction form
   9,900/20,617 = 20,617/x
3. Step 3: Cross multiply
   9,900x = 20,617 × 20,617
4. Step 4: Simplify right side
   9,900x = 425,060,689
5. Step 5: Solve for x
   x = 425,060,689/9,900
6. Step 6: Final answer
   x = 42,935.42