Finding the Fourth Proportional to 3,618.72, 5,417.28 and 3,243.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,618.72 : 5,417.28 = 3,243.20 : x
2. Step 2: Convert to fraction form
   3,618.72/5,417.28 = 3,243.20/x
3. Step 3: Cross multiply
   3,618.72x = 5,417.28 × 3,243.20
4. Step 4: Simplify right side
   3,618.72x = 17,569,322.50
5. Step 5: Solve for x
   x = 17,569,322.50/3,618.72
6. Step 6: Final answer
   x = 4,855.12