Finding the Third Proportional to 9,920,564 and 21,258,304

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920,564 : 21,258,304 = 21,258,304 : x
2. Step 2: Convert to fraction form
   9,920,564/21,258,304 = 21,258,304/x
3. Step 3: Cross multiply
   9,920,564x = 21,258,304 × 21,258,304
4. Step 4: Simplify right side
   9,920,564x = 451,915,488,956,416
5. Step 5: Solve for x
   x = 451,915,488,956,416/9,920,564
6. Step 6: Final answer
   x = 45,553,406.94