Finding the Third Proportional to 3,992,042 and 8,639,572

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992,042 : 8,639,572 = 8,639,572 : x
2. Step 2: Convert to fraction form
   3,992,042/8,639,572 = 8,639,572/x
3. Step 3: Cross multiply
   3,992,042x = 8,639,572 × 8,639,572
4. Step 4: Simplify right side
   3,992,042x = 74,642,204,343,184
5. Step 5: Solve for x
   x = 74,642,204,343,184/3,992,042
6. Step 6: Final answer
   x = 18,697,750.26