Finding the Third Proportional to 3,990,391 and 8,264,552

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990,391 : 8,264,552 = 8,264,552 : x
2. Step 2: Convert to fraction form
   3,990,391/8,264,552 = 8,264,552/x
3. Step 3: Cross multiply
   3,990,391x = 8,264,552 × 8,264,552
4. Step 4: Simplify right side
   3,990,391x = 68,302,819,760,704
5. Step 5: Solve for x
   x = 68,302,819,760,704/3,990,391
6. Step 6: Final answer
   x = 17,116,823.83