Finding the Fourth Proportional to 1,061.40, 1,589.14 and 540.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.40 : 1,589.14 = 540.28 : x
2. Step 2: Convert to fraction form
   1,061.40/1,589.14 = 540.28/x
3. Step 3: Cross multiply
   1,061.40x = 1,589.14 × 540.28
4. Step 4: Simplify right side
   1,061.40x = 858,576.92
5. Step 5: Solve for x
   x = 858,576.92/1,061.40
6. Step 6: Final answer
   x = 808.91