Finding the Third Proportional to 3,879,666 and 8,430,852

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,666 : 8,430,852 = 8,430,852 : x
2. Step 2: Convert to fraction form
   3,879,666/8,430,852 = 8,430,852/x
3. Step 3: Cross multiply
   3,879,666x = 8,430,852 × 8,430,852
4. Step 4: Simplify right side
   3,879,666x = 71,079,265,445,904
5. Step 5: Solve for x
   x = 71,079,265,445,904/3,879,666
6. Step 6: Final answer
   x = 18,320,975.43