Finding the Third Proportional to 3,939,178 and 8,568,539

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939,178 : 8,568,539 = 8,568,539 : x
2. Step 2: Convert to fraction form
   3,939,178/8,568,539 = 8,568,539/x
3. Step 3: Cross multiply
   3,939,178x = 8,568,539 × 8,568,539
4. Step 4: Simplify right side
   3,939,178x = 73,419,860,594,521
5. Step 5: Solve for x
   x = 73,419,860,594,521/3,939,178
6. Step 6: Final answer
   x = 18,638,370.90