Finding the Third Proportional to 3,899,447 and 8,415,448

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899,447 : 8,415,448 = 8,415,448 : x
2. Step 2: Convert to fraction form
   3,899,447/8,415,448 = 8,415,448/x
3. Step 3: Cross multiply
   3,899,447x = 8,415,448 × 8,415,448
4. Step 4: Simplify right side
   3,899,447x = 70,819,765,040,704
5. Step 5: Solve for x
   x = 70,819,765,040,704/3,899,447
6. Step 6: Final answer
   x = 18,161,489.32