Finding the Fourth Proportional to 1,078.32, 1,614.72 and 712.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.32 : 1,614.72 = 712.56 : x
2. Step 2: Convert to fraction form
   1,078.32/1,614.72 = 712.56/x
3. Step 3: Cross multiply
   1,078.32x = 1,614.72 × 712.56
4. Step 4: Simplify right side
   1,078.32x = 1,150,584.88
5. Step 5: Solve for x
   x = 1,150,584.88/1,078.32
6. Step 6: Final answer
   x = 1,067.02