Finding the Fourth Proportional to 2,311.31, 3,189.71 and 1,263.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.31 : 3,189.71 = 1,263.44 : x
2. Step 2: Convert to fraction form
   2,311.31/3,189.71 = 1,263.44/x
3. Step 3: Cross multiply
   2,311.31x = 3,189.71 × 1,263.44
4. Step 4: Simplify right side
   2,311.31x = 4,030,000.89
5. Step 5: Solve for x
   x = 4,030,000.89/2,311.31
6. Step 6: Final answer
   x = 1,743.60