Finding the Fourth Proportional to 1,053.23, 1,578.94 and 404.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.23 : 1,578.94 = 404.42 : x
2. Step 2: Convert to fraction form
   1,053.23/1,578.94 = 404.42/x
3. Step 3: Cross multiply
   1,053.23x = 1,578.94 × 404.42
4. Step 4: Simplify right side
   1,053.23x = 638,554.91
5. Step 5: Solve for x
   x = 638,554.91/1,053.23
6. Step 6: Final answer
   x = 606.28