Finding the Fourth Proportional to 2,509.43, 3,462.81 and 1,390.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,509.43 : 3,462.81 = 1,390.28 : x
2. Step 2: Convert to fraction form
   2,509.43/3,462.81 = 1,390.28/x
3. Step 3: Cross multiply
   2,509.43x = 3,462.81 × 1,390.28
4. Step 4: Simplify right side
   2,509.43x = 4,814,258.17
5. Step 5: Solve for x
   x = 4,814,258.17/2,509.43
6. Step 6: Final answer
   x = 1,918.47