Finding the Fourth Proportional to 3,813.55, 5,720.83 and 1,040.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,813.55 : 5,720.83 = 1,040.31 : x
2. Step 2: Convert to fraction form
   3,813.55/5,720.83 = 1,040.31/x
3. Step 3: Cross multiply
   3,813.55x = 5,720.83 × 1,040.31
4. Step 4: Simplify right side
   3,813.55x = 5,951,434.06
5. Step 5: Solve for x
   x = 5,951,434.06/3,813.55
6. Step 6: Final answer
   x = 1,560.60