Finding the Third Proportional to 4,065,642 and 8,691,348

Step by Step Solution

1. Step 1: Write the proportion equation
   4,065,642 : 8,691,348 = 8,691,348 : x
2. Step 2: Convert to fraction form
   4,065,642/8,691,348 = 8,691,348/x
3. Step 3: Cross multiply
   4,065,642x = 8,691,348 × 8,691,348
4. Step 4: Simplify right side
   4,065,642x = 75,539,530,057,104
5. Step 5: Solve for x
   x = 75,539,530,057,104/4,065,642
6. Step 6: Final answer
   x = 18,579,975.82