Finding the Third Proportional to 3,990,612 and 8,727,720

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990,612 : 8,727,720 = 8,727,720 : x
2. Step 2: Convert to fraction form
   3,990,612/8,727,720 = 8,727,720/x
3. Step 3: Cross multiply
   3,990,612x = 8,727,720 × 8,727,720
4. Step 4: Simplify right side
   3,990,612x = 76,173,096,398,400
5. Step 5: Solve for x
   x = 76,173,096,398,400/3,990,612
6. Step 6: Final answer
   x = 19,088,073.81