Finding the Fourth Proportional to 5,321.28, 7,335.81 and 3,828.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,321.28 : 7,335.81 = 3,828.72 : x
2. Step 2: Convert to fraction form
   5,321.28/7,335.81 = 3,828.72/x
3. Step 3: Cross multiply
   5,321.28x = 7,335.81 × 3,828.72
4. Step 4: Simplify right side
   5,321.28x = 28,086,762.46
5. Step 5: Solve for x
   x = 28,086,762.46/5,321.28
6. Step 6: Final answer
   x = 5,278.20