Finding the Third Proportional to 3,863,912 and 8,391,696

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,912 : 8,391,696 = 8,391,696 : x
2. Step 2: Convert to fraction form
   3,863,912/8,391,696 = 8,391,696/x
3. Step 3: Cross multiply
   3,863,912x = 8,391,696 × 8,391,696
4. Step 4: Simplify right side
   3,863,912x = 70,420,561,756,416
5. Step 5: Solve for x
   x = 70,420,561,756,416/3,863,912
6. Step 6: Final answer
   x = 18,225,198.13