Finding the Fourth Proportional to 1,443.68, 2,162.80 and 712.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.68 : 2,162.80 = 712.40 : x
2. Step 2: Convert to fraction form
   1,443.68/2,162.80 = 712.40/x
3. Step 3: Cross multiply
   1,443.68x = 2,162.80 × 712.40
4. Step 4: Simplify right side
   1,443.68x = 1,540,778.72
5. Step 5: Solve for x
   x = 1,540,778.72/1,443.68
6. Step 6: Final answer
   x = 1,067.26