Finding the Fourth Proportional to 1,061.13, 1,591.71 and 330.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.13 : 1,591.71 = 330.78 : x
2. Step 2: Convert to fraction form
   1,061.13/1,591.71 = 330.78/x
3. Step 3: Cross multiply
   1,061.13x = 1,591.71 × 330.78
4. Step 4: Simplify right side
   1,061.13x = 526,505.83
5. Step 5: Solve for x
   x = 526,505.83/1,061.13
6. Step 6: Final answer
   x = 496.17