Finding the Third Proportional to 3,940,578 and 8,509,844

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,578 : 8,509,844 = 8,509,844 : x
2. Step 2: Convert to fraction form
   3,940,578/8,509,844 = 8,509,844/x
3. Step 3: Cross multiply
   3,940,578x = 8,509,844 × 8,509,844
4. Step 4: Simplify right side
   3,940,578x = 72,417,444,904,336
5. Step 5: Solve for x
   x = 72,417,444,904,336/3,940,578
6. Step 6: Final answer
   x = 18,377,366.19