Finding the Fourth Proportional to 1,053.75, 1,579.72 and 404.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.75 : 1,579.72 = 404.03 : x
2. Step 2: Convert to fraction form
   1,053.75/1,579.72 = 404.03/x
3. Step 3: Cross multiply
   1,053.75x = 1,579.72 × 404.03
4. Step 4: Simplify right side
   1,053.75x = 638,254.27
5. Step 5: Solve for x
   x = 638,254.27/1,053.75
6. Step 6: Final answer
   x = 605.70