Finding the Fourth Proportional to 2,311.52, 3,189.91 and 1,263.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.52 : 3,189.91 = 1,263.61 : x
2. Step 2: Convert to fraction form
   2,311.52/3,189.91 = 1,263.61/x
3. Step 3: Cross multiply
   2,311.52x = 3,189.91 × 1,263.61
4. Step 4: Simplify right side
   2,311.52x = 4,030,802.18
5. Step 5: Solve for x
   x = 4,030,802.18/2,311.52
6. Step 6: Final answer
   x = 1,743.79