Finding the Third Proportional to 3,990,564 and 8,727,624

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990,564 : 8,727,624 = 8,727,624 : x
2. Step 2: Convert to fraction form
   3,990,564/8,727,624 = 8,727,624/x
3. Step 3: Cross multiply
   3,990,564x = 8,727,624 × 8,727,624
4. Step 4: Simplify right side
   3,990,564x = 76,171,420,685,376
5. Step 5: Solve for x
   x = 76,171,420,685,376/3,990,564
6. Step 6: Final answer
   x = 19,087,883.49