Finding the Fourth Proportional to 2,311.92, 3,189.71 and 1,317.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.92 : 3,189.71 = 1,317.05 : x
2. Step 2: Convert to fraction form
   2,311.92/3,189.71 = 1,317.05/x
3. Step 3: Cross multiply
   2,311.92x = 3,189.71 × 1,317.05
4. Step 4: Simplify right side
   2,311.92x = 4,200,985.02
5. Step 5: Solve for x
   x = 4,200,985.02/2,311.92
6. Step 6: Final answer
   x = 1,817.10