Finding the Fourth Proportional to 1,328.83, 1,992.89 and 404.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.83 : 1,992.89 = 404.15 : x
2. Step 2: Convert to fraction form
   1,328.83/1,992.89 = 404.15/x
3. Step 3: Cross multiply
   1,328.83x = 1,992.89 × 404.15
4. Step 4: Simplify right side
   1,328.83x = 805,417.54
5. Step 5: Solve for x
   x = 805,417.54/1,328.83
6. Step 6: Final answer
   x = 606.11