Finding the Fourth Proportional to 1,329.57, 1,993.59 and 404.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.57 : 1,993.59 = 404.87 : x
2. Step 2: Convert to fraction form
   1,329.57/1,993.59 = 404.87/x
3. Step 3: Cross multiply
   1,329.57x = 1,993.59 × 404.87
4. Step 4: Simplify right side
   1,329.57x = 807,134.82
5. Step 5: Solve for x
   x = 807,134.82/1,329.57
6. Step 6: Final answer
   x = 607.06