Finding the Third Proportional to 3,879,987 and 5,873,643

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879,987 : 5,873,643 = 5,873,643 : x
2. Step 2: Convert to fraction form
   3,879,987/5,873,643 = 5,873,643/x
3. Step 3: Cross multiply
   3,879,987x = 5,873,643 × 5,873,643
4. Step 4: Simplify right side
   3,879,987x = 34,499,682,091,449
5. Step 5: Solve for x
   x = 34,499,682,091,449/3,879,987
6. Step 6: Final answer
   x = 8,891,700.43