Finding the Fourth Proportional to 1,040.53, 1,560.52 and 578.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.53 : 1,560.52 = 578.56 : x
2. Step 2: Convert to fraction form
   1,040.53/1,560.52 = 578.56/x
3. Step 3: Cross multiply
   1,040.53x = 1,560.52 × 578.56
4. Step 4: Simplify right side
   1,040.53x = 902,851.27
5. Step 5: Solve for x
   x = 902,851.27/1,040.53
6. Step 6: Final answer
   x = 867.69