Finding the Third Proportional to 3,863,704 and 8,391,123

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863,704 : 8,391,123 = 8,391,123 : x
2. Step 2: Convert to fraction form
   3,863,704/8,391,123 = 8,391,123/x
3. Step 3: Cross multiply
   3,863,704x = 8,391,123 × 8,391,123
4. Step 4: Simplify right side
   3,863,704x = 70,410,945,201,129
5. Step 5: Solve for x
   x = 70,410,945,201,129/3,863,704
6. Step 6: Final answer
   x = 18,223,690.32