Finding the Fourth Proportional to 2,311.34, 3,189.72 and 1,316.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.34 : 3,189.72 = 1,316.77 : x
2. Step 2: Convert to fraction form
   2,311.34/3,189.72 = 1,316.77/x
3. Step 3: Cross multiply
   2,311.34x = 3,189.72 × 1,316.77
4. Step 4: Simplify right side
   2,311.34x = 4,200,124.57
5. Step 5: Solve for x
   x = 4,200,124.57/2,311.34
6. Step 6: Final answer
   x = 1,817.19