Finding the Fourth Proportional to 2,311.55, 3,189.93 and 1,263.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.55 : 3,189.93 = 1,263.61 : x
2. Step 2: Convert to fraction form
   2,311.55/3,189.93 = 1,263.61/x
3. Step 3: Cross multiply
   2,311.55x = 3,189.93 × 1,263.61
4. Step 4: Simplify right side
   2,311.55x = 4,030,831.38
5. Step 5: Solve for x
   x = 4,030,831.38/2,311.55
6. Step 6: Final answer
   x = 1,743.78