Finding the Third Proportional to 3,899,445 and 8,415,444

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899,445 : 8,415,444 = 8,415,444 : x
2. Step 2: Convert to fraction form
   3,899,445/8,415,444 = 8,415,444/x
3. Step 3: Cross multiply
   3,899,445x = 8,415,444 × 8,415,444
4. Step 4: Simplify right side
   3,899,445x = 70,819,697,717,136
5. Step 5: Solve for x
   x = 70,819,697,717,136/3,899,445
6. Step 6: Final answer
   x = 18,161,481.37