Finding the Fourth Proportional to 1,329.16, 1,993.89 and 355.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.16 : 1,993.89 = 355.30 : x
2. Step 2: Convert to fraction form
   1,329.16/1,993.89 = 355.30/x
3. Step 3: Cross multiply
   1,329.16x = 1,993.89 × 355.30
4. Step 4: Simplify right side
   1,329.16x = 708,429.12
5. Step 5: Solve for x
   x = 708,429.12/1,329.16
6. Step 6: Final answer
   x = 532.99