Finding the Fourth Proportional to 1,061.11, 1,591.59 and 330.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.11 : 1,591.59 = 330.63 : x
2. Step 2: Convert to fraction form
   1,061.11/1,591.59 = 330.63/x
3. Step 3: Cross multiply
   1,061.11x = 1,591.59 × 330.63
4. Step 4: Simplify right side
   1,061.11x = 526,227.40
5. Step 5: Solve for x
   x = 526,227.40/1,061.11
6. Step 6: Final answer
   x = 495.92