Finding the Fourth Proportional to 1,061.34, 1,591.47 and 330.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.34 : 1,591.47 = 330.72 : x
2. Step 2: Convert to fraction form
   1,061.34/1,591.47 = 330.72/x
3. Step 3: Cross multiply
   1,061.34x = 1,591.47 × 330.72
4. Step 4: Simplify right side
   1,061.34x = 526,330.96
5. Step 5: Solve for x
   x = 526,330.96/1,061.34
6. Step 6: Final answer
   x = 495.91