Finding the Fourth Proportional to 1,053.59, 1,580.81 and 404.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.59 : 1,580.81 = 404.15 : x
2. Step 2: Convert to fraction form
   1,053.59/1,580.81 = 404.15/x
3. Step 3: Cross multiply
   1,053.59x = 1,580.81 × 404.15
4. Step 4: Simplify right side
   1,053.59x = 638,874.44
5. Step 5: Solve for x
   x = 638,874.44/1,053.59
6. Step 6: Final answer
   x = 606.38