Finding the Fourth Proportional to 2,238.11, 3,089.71 and 1,399.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,238.11 : 3,089.71 = 1,399.28 : x
2. Step 2: Convert to fraction form
   2,238.11/3,089.71 = 1,399.28/x
3. Step 3: Cross multiply
   2,238.11x = 3,089.71 × 1,399.28
4. Step 4: Simplify right side
   2,238.11x = 4,323,369.41
5. Step 5: Solve for x
   x = 4,323,369.41/2,238.11
6. Step 6: Final answer
   x = 1,931.71