Finding the Third Proportional to 3,863,868 and 8,391,456

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,868 : 8,391,456 = 8,391,456 : x
2. Step 2: Convert to fraction form
   3,863,868/8,391,456 = 8,391,456/x
3. Step 3: Cross multiply
   3,863,868x = 8,391,456 × 8,391,456
4. Step 4: Simplify right side
   3,863,868x = 70,416,533,799,936
5. Step 5: Solve for x
   x = 70,416,533,799,936/3,863,868
6. Step 6: Final answer
   x = 18,224,363.20