Finding the Fourth Proportional to 8,256.78, 12,388.68 and 5,484.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,256.78 : 12,388.68 = 5,484.42 : x
2. Step 2: Convert to fraction form
   8,256.78/12,388.68 = 5,484.42/x
3. Step 3: Cross multiply
   8,256.78x = 12,388.68 × 5,484.42
4. Step 4: Simplify right side
   8,256.78x = 67,944,724.37
5. Step 5: Solve for x
   x = 67,944,724.37/8,256.78
6. Step 6: Final answer
   x = 8,228.96