Finding the Fourth Proportional to 1,061.06, 1,591.49 and 330.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.06 : 1,591.49 = 330.56 : x
2. Step 2: Convert to fraction form
   1,061.06/1,591.49 = 330.56/x
3. Step 3: Cross multiply
   1,061.06x = 1,591.49 × 330.56
4. Step 4: Simplify right side
   1,061.06x = 526,087.74
5. Step 5: Solve for x
   x = 526,087.74/1,061.06
6. Step 6: Final answer
   x = 495.82