Finding the Third Proportional to 3,945,401 and 8,490,039

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,401 : 8,490,039 = 8,490,039 : x
2. Step 2: Convert to fraction form
   3,945,401/8,490,039 = 8,490,039/x
3. Step 3: Cross multiply
   3,945,401x = 8,490,039 × 8,490,039
4. Step 4: Simplify right side
   3,945,401x = 72,080,762,221,521
5. Step 5: Solve for x
   x = 72,080,762,221,521/3,945,401
6. Step 6: Final answer
   x = 18,269,565.56