Finding the Third Proportional to 4,021,531 and 8,618,728

Step by Step Solution

1. Step 1: Write the proportion equation
   4,021,531 : 8,618,728 = 8,618,728 : x
2. Step 2: Convert to fraction form
   4,021,531/8,618,728 = 8,618,728/x
3. Step 3: Cross multiply
   4,021,531x = 8,618,728 × 8,618,728
4. Step 4: Simplify right side
   4,021,531x = 74,282,472,337,984
5. Step 5: Solve for x
   x = 74,282,472,337,984/4,021,531
6. Step 6: Final answer
   x = 18,471,192.27