Finding the Third Proportional to 3,940,434 and 8,509,572

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,434 : 8,509,572 = 8,509,572 : x
2. Step 2: Convert to fraction form
   3,940,434/8,509,572 = 8,509,572/x
3. Step 3: Cross multiply
   3,940,434x = 8,509,572 × 8,509,572
4. Step 4: Simplify right side
   3,940,434x = 72,412,815,623,184
5. Step 5: Solve for x
   x = 72,412,815,623,184/3,940,434
6. Step 6: Final answer
   x = 18,376,862.96