Finding the Fourth Proportional to 8,576.61, 12,857.52 and 3,315.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,576.61 : 12,857.52 = 3,315.31 : x
2. Step 2: Convert to fraction form
   8,576.61/12,857.52 = 3,315.31/x
3. Step 3: Cross multiply
   8,576.61x = 12,857.52 × 3,315.31
4. Step 4: Simplify right side
   8,576.61x = 42,626,664.63
5. Step 5: Solve for x
   x = 42,626,664.63/8,576.61
6. Step 6: Final answer
   x = 4,970.11