Finding the Fourth Proportional to 1,040.30, 1,435.61 and 574.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.30 : 1,435.61 = 574.55 : x
2. Step 2: Convert to fraction form
   1,040.30/1,435.61 = 574.55/x
3. Step 3: Cross multiply
   1,040.30x = 1,435.61 × 574.55
4. Step 4: Simplify right side
   1,040.30x = 824,829.73
5. Step 5: Solve for x
   x = 824,829.73/1,040.30
6. Step 6: Final answer
   x = 792.88