Finding the Fourth Proportional to 1,329.12, 1,993.69 and 404.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.12 : 1,993.69 = 404.83 : x
2. Step 2: Convert to fraction form
   1,329.12/1,993.69 = 404.83/x
3. Step 3: Cross multiply
   1,329.12x = 1,993.69 × 404.83
4. Step 4: Simplify right side
   1,329.12x = 807,105.52
5. Step 5: Solve for x
   x = 807,105.52/1,329.12
6. Step 6: Final answer
   x = 607.25