Finding the Fourth Proportional to 1,061.16, 1,591.62 and 330.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.16 : 1,591.62 = 330.60 : x
2. Step 2: Convert to fraction form
   1,061.16/1,591.62 = 330.60/x
3. Step 3: Cross multiply
   1,061.16x = 1,591.62 × 330.60
4. Step 4: Simplify right side
   1,061.16x = 526,189.57
5. Step 5: Solve for x
   x = 526,189.57/1,061.16
6. Step 6: Final answer
   x = 495.86