Finding the Fourth Proportional to 8,238.78, 12,359.79 and 4,078.62

Step by Step Solution

1. Step 1: Write the proportion equation
   8,238.78 : 12,359.79 = 4,078.62 : x
2. Step 2: Convert to fraction form
   8,238.78/12,359.79 = 4,078.62/x
3. Step 3: Cross multiply
   8,238.78x = 12,359.79 × 4,078.62
4. Step 4: Simplify right side
   8,238.78x = 50,410,886.69
5. Step 5: Solve for x
   x = 50,410,886.69/8,238.78
6. Step 6: Final answer
   x = 6,118.73