Finding the Third Proportional to 3,945,866 and 8,479,145

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,866 : 8,479,145 = 8,479,145 : x
2. Step 2: Convert to fraction form
   3,945,866/8,479,145 = 8,479,145/x
3. Step 3: Cross multiply
   3,945,866x = 8,479,145 × 8,479,145
4. Step 4: Simplify right side
   3,945,866x = 71,895,899,931,025
5. Step 5: Solve for x
   x = 71,895,899,931,025/3,945,866
6. Step 6: Final answer
   x = 18,220,562.97