Finding the Fourth Proportional to 2,311.17, 3,189.33 and 1,263.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.17 : 3,189.33 = 1,263.21 : x
2. Step 2: Convert to fraction form
   2,311.17/3,189.33 = 1,263.21/x
3. Step 3: Cross multiply
   2,311.17x = 3,189.33 × 1,263.21
4. Step 4: Simplify right side
   2,311.17x = 4,028,793.55
5. Step 5: Solve for x
   x = 4,028,793.55/2,311.17
6. Step 6: Final answer
   x = 1,743.18