Finding the Fourth Proportional to 2,311.67, 3,190.06 and 1,263.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.67 : 3,190.06 = 1,263.71 : x
2. Step 2: Convert to fraction form
   2,311.67/3,190.06 = 1,263.71/x
3. Step 3: Cross multiply
   2,311.67x = 3,190.06 × 1,263.71
4. Step 4: Simplify right side
   2,311.67x = 4,031,310.72
5. Step 5: Solve for x
   x = 4,031,310.72/2,311.67
6. Step 6: Final answer
   x = 1,743.90