Finding the Fourth Proportional to 8,855.91, 12,217.49 and 5,270.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,855.91 : 12,217.49 = 5,270.15 : x
2. Step 2: Convert to fraction form
   8,855.91/12,217.49 = 5,270.15/x
3. Step 3: Cross multiply
   8,855.91x = 12,217.49 × 5,270.15
4. Step 4: Simplify right side
   8,855.91x = 64,388,022.29
5. Step 5: Solve for x
   x = 64,388,022.29/8,855.91
6. Step 6: Final answer
   x = 7,270.63