Finding the Fourth Proportional to 8,760.72, 13,147.56 and 3,217.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,760.72 : 13,147.56 = 3,217.50 : x
2. Step 2: Convert to fraction form
   8,760.72/13,147.56 = 3,217.50/x
3. Step 3: Cross multiply
   8,760.72x = 13,147.56 × 3,217.50
4. Step 4: Simplify right side
   8,760.72x = 42,302,274.30
5. Step 5: Solve for x
   x = 42,302,274.30/8,760.72
6. Step 6: Final answer
   x = 4,828.63