Finding the Third Proportional to 9,900 and 21,508

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900 : 21,508 = 21,508 : x
2. Step 2: Convert to fraction form
   9,900/21,508 = 21,508/x
3. Step 3: Cross multiply
   9,900x = 21,508 × 21,508
4. Step 4: Simplify right side
   9,900x = 462,594,064
5. Step 5: Solve for x
   x = 462,594,064/9,900
6. Step 6: Final answer
   x = 46,726.67