Finding the Third Proportional to 3,891,758 and 8,288,686

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891,758 : 8,288,686 = 8,288,686 : x
2. Step 2: Convert to fraction form
   3,891,758/8,288,686 = 8,288,686/x
3. Step 3: Cross multiply
   3,891,758x = 8,288,686 × 8,288,686
4. Step 4: Simplify right side
   3,891,758x = 68,702,315,606,596
5. Step 5: Solve for x
   x = 68,702,315,606,596/3,891,758
6. Step 6: Final answer
   x = 17,653,285.64