Finding the Fourth Proportional to 1,040.27, 1,559.89 and 346.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.27 : 1,559.89 = 346.70 : x
2. Step 2: Convert to fraction form
   1,040.27/1,559.89 = 346.70/x
3. Step 3: Cross multiply
   1,040.27x = 1,559.89 × 346.70
4. Step 4: Simplify right side
   1,040.27x = 540,813.86
5. Step 5: Solve for x
   x = 540,813.86/1,040.27
6. Step 6: Final answer
   x = 519.88