Finding the Third Proportional to 9,920,636 and 21,258,436

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920,636 : 21,258,436 = 21,258,436 : x
2. Step 2: Convert to fraction form
   9,920,636/21,258,436 = 21,258,436/x
3. Step 3: Cross multiply
   9,920,636x = 21,258,436 × 21,258,436
4. Step 4: Simplify right side
   9,920,636x = 451,921,101,166,096
5. Step 5: Solve for x
   x = 451,921,101,166,096/9,920,636
6. Step 6: Final answer
   x = 45,553,642.04