Finding the Third Proportional to 9,908 and 21,228

Step by Step Solution

1. Step 1: Write the proportion equation
   9,908 : 21,228 = 21,228 : x
2. Step 2: Convert to fraction form
   9,908/21,228 = 21,228/x
3. Step 3: Cross multiply
   9,908x = 21,228 × 21,228
4. Step 4: Simplify right side
   9,908x = 450,627,984
5. Step 5: Solve for x
   x = 450,627,984/9,908
6. Step 6: Final answer
   x = 45,481.23