Finding the Fourth Proportional to 2,228.28, 3,073.79 and 1,431.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,228.28 : 3,073.79 = 1,431.72 : x
2. Step 2: Convert to fraction form
   2,228.28/3,073.79 = 1,431.72/x
3. Step 3: Cross multiply
   2,228.28x = 3,073.79 × 1,431.72
4. Step 4: Simplify right side
   2,228.28x = 4,400,806.17
5. Step 5: Solve for x
   x = 4,400,806.17/2,228.28
6. Step 6: Final answer
   x = 1,974.98