Finding the Third Proportional to 3,879,678 and 8,430,882

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,678 : 8,430,882 = 8,430,882 : x
2. Step 2: Convert to fraction form
   3,879,678/8,430,882 = 8,430,882/x
3. Step 3: Cross multiply
   3,879,678x = 8,430,882 × 8,430,882
4. Step 4: Simplify right side
   3,879,678x = 71,079,771,297,924
5. Step 5: Solve for x
   x = 71,079,771,297,924/3,879,678
6. Step 6: Final answer
   x = 18,321,049.14