Finding the Third Proportional to 2,515,586 and 5,431,638

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515,586 : 5,431,638 = 5,431,638 : x
2. Step 2: Convert to fraction form
   2,515,586/5,431,638 = 5,431,638/x
3. Step 3: Cross multiply
   2,515,586x = 5,431,638 × 5,431,638
4. Step 4: Simplify right side
   2,515,586x = 29,502,691,363,044
5. Step 5: Solve for x
   x = 29,502,691,363,044/2,515,586
6. Step 6: Final answer
   x = 11,727,959.75