Finding the Fourth Proportional to 8,960.72, 12,355.08 and 5,815.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,960.72 : 12,355.08 = 5,815.76 : x
2. Step 2: Convert to fraction form
   8,960.72/12,355.08 = 5,815.76/x
3. Step 3: Cross multiply
   8,960.72x = 12,355.08 × 5,815.76
4. Step 4: Simplify right side
   8,960.72x = 71,854,180.06
5. Step 5: Solve for x
   x = 71,854,180.06/8,960.72
6. Step 6: Final answer
   x = 8,018.80