Finding the Fourth Proportional to 1,152.38, 1,728.87 and 330.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.38 : 1,728.87 = 330.72 : x
2. Step 2: Convert to fraction form
   1,152.38/1,728.87 = 330.72/x
3. Step 3: Cross multiply
   1,152.38x = 1,728.87 × 330.72
4. Step 4: Simplify right side
   1,152.38x = 571,771.89
5. Step 5: Solve for x
   x = 571,771.89/1,152.38
6. Step 6: Final answer
   x = 496.17