Finding the Fourth Proportional to 1,328.76, 1,992.42 and 404.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.76 : 1,992.42 = 404.04 : x
2. Step 2: Convert to fraction form
   1,328.76/1,992.42 = 404.04/x
3. Step 3: Cross multiply
   1,328.76x = 1,992.42 × 404.04
4. Step 4: Simplify right side
   1,328.76x = 805,017.38
5. Step 5: Solve for x
   x = 805,017.38/1,328.76
6. Step 6: Final answer
   x = 605.84