Finding the Fourth Proportional to 1,152.77, 1,728.89 and 330.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.77 : 1,728.89 = 330.86 : x
2. Step 2: Convert to fraction form
   1,152.77/1,728.89 = 330.86/x
3. Step 3: Cross multiply
   1,152.77x = 1,728.89 × 330.86
4. Step 4: Simplify right side
   1,152.77x = 572,012.73
5. Step 5: Solve for x
   x = 572,012.73/1,152.77
6. Step 6: Final answer
   x = 496.21