Finding the Fourth Proportional to 2,311.37, 3,189.61 and 1,316.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.37 : 3,189.61 = 1,316.79 : x
2. Step 2: Convert to fraction form
   2,311.37/3,189.61 = 1,316.79/x
3. Step 3: Cross multiply
   2,311.37x = 3,189.61 × 1,316.79
4. Step 4: Simplify right side
   2,311.37x = 4,200,033.90
5. Step 5: Solve for x
   x = 4,200,033.90/2,311.37
6. Step 6: Final answer
   x = 1,817.12