Finding the Third Proportional to 3,863,910 and 8,391,692

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,910 : 8,391,692 = 8,391,692 : x
2. Step 2: Convert to fraction form
   3,863,910/8,391,692 = 8,391,692/x
3. Step 3: Cross multiply
   3,863,910x = 8,391,692 × 8,391,692
4. Step 4: Simplify right side
   3,863,910x = 70,420,494,622,864
5. Step 5: Solve for x
   x = 70,420,494,622,864/3,863,910
6. Step 6: Final answer
   x = 18,225,190.19