Finding the Third Proportional to 3,940,686 and 8,489,276

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,686 : 8,489,276 = 8,489,276 : x
2. Step 2: Convert to fraction form
   3,940,686/8,489,276 = 8,489,276/x
3. Step 3: Cross multiply
   3,940,686x = 8,489,276 × 8,489,276
4. Step 4: Simplify right side
   3,940,686x = 72,067,807,004,176
5. Step 5: Solve for x
   x = 72,067,807,004,176/3,940,686
6. Step 6: Final answer
   x = 18,288,137.40