Finding the Fourth Proportional to 9,255.45, 12,778.71 and 5,479.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,255.45 : 12,778.71 = 5,479.83 : x
2. Step 2: Convert to fraction form
   9,255.45/12,778.71 = 5,479.83/x
3. Step 3: Cross multiply
   9,255.45x = 12,778.71 × 5,479.83
4. Step 4: Simplify right side
   9,255.45x = 70,025,158.42
5. Step 5: Solve for x
   x = 70,025,158.42/9,255.45
6. Step 6: Final answer
   x = 7,565.83