Finding the Fourth Proportional to 1,171.54, 1,756.72 and 391.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.54 : 1,756.72 = 391.27 : x
2. Step 2: Convert to fraction form
   1,171.54/1,756.72 = 391.27/x
3. Step 3: Cross multiply
   1,171.54x = 1,756.72 × 391.27
4. Step 4: Simplify right side
   1,171.54x = 687,351.83
5. Step 5: Solve for x
   x = 687,351.83/1,171.54
6. Step 6: Final answer
   x = 586.71