Finding the Fourth Proportional to 2,871.97, 4,309.89 and 1,228.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,871.97 : 4,309.89 = 1,228.90 : x
2. Step 2: Convert to fraction form
   2,871.97/4,309.89 = 1,228.90/x
3. Step 3: Cross multiply
   2,871.97x = 4,309.89 × 1,228.90
4. Step 4: Simplify right side
   2,871.97x = 5,296,423.82
5. Step 5: Solve for x
   x = 5,296,423.82/2,871.97
6. Step 6: Final answer
   x = 1,844.18