Finding the Fourth Proportional to 5,478.72, 8,223.56 and 2,559.08

Step by Step Solution

1. Step 1: Write the proportion equation
   5,478.72 : 8,223.56 = 2,559.08 : x
2. Step 2: Convert to fraction form
   5,478.72/8,223.56 = 2,559.08/x
3. Step 3: Cross multiply
   5,478.72x = 8,223.56 × 2,559.08
4. Step 4: Simplify right side
   5,478.72x = 21,044,747.92
5. Step 5: Solve for x
   x = 21,044,747.92/5,478.72
6. Step 6: Final answer
   x = 3,841.18