Finding the Fourth Proportional to 2,311.52, 3,189.92 and 1,317.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.52 : 3,189.92 = 1,317.15 : x
2. Step 2: Convert to fraction form
   2,311.52/3,189.92 = 1,317.15/x
3. Step 3: Cross multiply
   2,311.52x = 3,189.92 × 1,317.15
4. Step 4: Simplify right side
   2,311.52x = 4,201,596.54
5. Step 5: Solve for x
   x = 4,201,596.54/2,311.52
6. Step 6: Final answer
   x = 1,817.68