Finding the Fourth Proportional to 8,879.79, 12,256.25 and 5,342.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,879.79 : 12,256.25 = 5,342.31 : x
2. Step 2: Convert to fraction form
   8,879.79/12,256.25 = 5,342.31/x
3. Step 3: Cross multiply
   8,879.79x = 12,256.25 × 5,342.31
4. Step 4: Simplify right side
   8,879.79x = 65,476,686.94
5. Step 5: Solve for x
   x = 65,476,686.94/8,879.79
6. Step 6: Final answer
   x = 7,373.68