Finding the Fourth Proportional to 2,311.50, 3,189.87 and 1,263.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.50 : 3,189.87 = 1,263.57 : x
2. Step 2: Convert to fraction form
   2,311.50/3,189.87 = 1,263.57/x
3. Step 3: Cross multiply
   2,311.50x = 3,189.87 × 1,263.57
4. Step 4: Simplify right side
   2,311.50x = 4,030,624.04
5. Step 5: Solve for x
   x = 4,030,624.04/2,311.50
6. Step 6: Final answer
   x = 1,743.73