Finding the Fourth Proportional to 1,059.18, 1,589.02 and 328.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.18 : 1,589.02 = 328.72 : x
2. Step 2: Convert to fraction form
   1,059.18/1,589.02 = 328.72/x
3. Step 3: Cross multiply
   1,059.18x = 1,589.02 × 328.72
4. Step 4: Simplify right side
   1,059.18x = 522,337.86
5. Step 5: Solve for x
   x = 522,337.86/1,059.18
6. Step 6: Final answer
   x = 493.15