Finding the Fourth Proportional to 1,328.85, 1,992.56 and 404.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.85 : 1,992.56 = 404.01 : x
2. Step 2: Convert to fraction form
   1,328.85/1,992.56 = 404.01/x
3. Step 3: Cross multiply
   1,328.85x = 1,992.56 × 404.01
4. Step 4: Simplify right side
   1,328.85x = 805,012.15
5. Step 5: Solve for x
   x = 805,012.15/1,328.85
6. Step 6: Final answer
   x = 605.80