Finding the Third Proportional to 3,863,908 and 8,391,688

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,908 : 8,391,688 = 8,391,688 : x
2. Step 2: Convert to fraction form
   3,863,908/8,391,688 = 8,391,688/x
3. Step 3: Cross multiply
   3,863,908x = 8,391,688 × 8,391,688
4. Step 4: Simplify right side
   3,863,908x = 70,420,427,489,344
5. Step 5: Solve for x
   x = 70,420,427,489,344/3,863,908
6. Step 6: Final answer
   x = 18,225,182.25