Finding the Fourth Proportional to 3,505.72, 5,256.78 and 1,040.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,505.72 : 5,256.78 = 1,040.23 : x
2. Step 2: Convert to fraction form
   3,505.72/5,256.78 = 1,040.23/x
3. Step 3: Cross multiply
   3,505.72x = 5,256.78 × 1,040.23
4. Step 4: Simplify right side
   3,505.72x = 5,468,260.26
5. Step 5: Solve for x
   x = 5,468,260.26/3,505.72
6. Step 6: Final answer
   x = 1,559.81