Finding the Third Proportional to 9,900 and 20,259

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900 : 20,259 = 20,259 : x
2. Step 2: Convert to fraction form
   9,900/20,259 = 20,259/x
3. Step 3: Cross multiply
   9,900x = 20,259 × 20,259
4. Step 4: Simplify right side
   9,900x = 410,427,081
5. Step 5: Solve for x
   x = 410,427,081/9,900
6. Step 6: Final answer
   x = 41,457.28