Finding the Fourth Proportional to 12,279, 18,404.16 and 5,257.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,279 : 18,404.16 = 5,257.02 : x
2. Step 2: Convert to fraction form
   12,279/18,404.16 = 5,257.02/x
3. Step 3: Cross multiply
   12,279x = 18,404.16 × 5,257.02
4. Step 4: Simplify right side
   12,279x = 96,751,037.20
5. Step 5: Solve for x
   x = 96,751,037.20/12,279
6. Step 6: Final answer
   x = 7,879.39