Finding the Fourth Proportional to 1,040.56, 1,560.72 and 271.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.56 : 1,560.72 = 271.12 : x
2. Step 2: Convert to fraction form
   1,040.56/1,560.72 = 271.12/x
3. Step 3: Cross multiply
   1,040.56x = 1,560.72 × 271.12
4. Step 4: Simplify right side
   1,040.56x = 423,142.41
5. Step 5: Solve for x
   x = 423,142.41/1,040.56
6. Step 6: Final answer
   x = 406.65