Finding the Third Proportional to 9,918 and 20,660

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918 : 20,660 = 20,660 : x
2. Step 2: Convert to fraction form
   9,918/20,660 = 20,660/x
3. Step 3: Cross multiply
   9,918x = 20,660 × 20,660
4. Step 4: Simplify right side
   9,918x = 426,835,600
5. Step 5: Solve for x
   x = 426,835,600/9,918
6. Step 6: Final answer
   x = 43,036.46