Finding the Fourth Proportional to 5,238.64, 7,229.52 and 2,880.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,238.64 : 7,229.52 = 2,880.72 : x
2. Step 2: Convert to fraction form
   5,238.64/7,229.52 = 2,880.72/x
3. Step 3: Cross multiply
   5,238.64x = 7,229.52 × 2,880.72
4. Step 4: Simplify right side
   5,238.64x = 20,826,222.85
5. Step 5: Solve for x
   x = 20,826,222.85/5,238.64
6. Step 6: Final answer
   x = 3,975.50