Finding the Fourth Proportional to 2,311.63, 3,189.67 and 1,316.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.63 : 3,189.67 = 1,316.86 : x
2. Step 2: Convert to fraction form
   2,311.63/3,189.67 = 1,316.86/x
3. Step 3: Cross multiply
   2,311.63x = 3,189.67 × 1,316.86
4. Step 4: Simplify right side
   2,311.63x = 4,200,337.57
5. Step 5: Solve for x
   x = 4,200,337.57/2,311.63
6. Step 6: Final answer
   x = 1,817.05