Finding the Third Proportional to 3,899,474 and 8,415,494

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899,474 : 8,415,494 = 8,415,494 : x
2. Step 2: Convert to fraction form
   3,899,474/8,415,494 = 8,415,494/x
3. Step 3: Cross multiply
   3,899,474x = 8,415,494 × 8,415,494
4. Step 4: Simplify right side
   3,899,474x = 70,820,539,264,036
5. Step 5: Solve for x
   x = 70,820,539,264,036/3,899,474
6. Step 6: Final answer
   x = 18,161,562.11