Finding the Fourth Proportional to 1,061.10, 1,591.56 and 330.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.10 : 1,591.56 = 330.60 : x
2. Step 2: Convert to fraction form
   1,061.10/1,591.56 = 330.60/x
3. Step 3: Cross multiply
   1,061.10x = 1,591.56 × 330.60
4. Step 4: Simplify right side
   1,061.10x = 526,169.74
5. Step 5: Solve for x
   x = 526,169.74/1,061.10
6. Step 6: Final answer
   x = 495.87