Finding the Fourth Proportional to 8,580.76, 12,860.52 and 5,067.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,580.76 : 12,860.52 = 5,067.20 : x
2. Step 2: Convert to fraction form
   8,580.76/12,860.52 = 5,067.20/x
3. Step 3: Cross multiply
   8,580.76x = 12,860.52 × 5,067.20
4. Step 4: Simplify right side
   8,580.76x = 65,166,826.94
5. Step 5: Solve for x
   x = 65,166,826.94/8,580.76
6. Step 6: Final answer
   x = 7,594.53