Finding the Fourth Proportional to 1,443.36, 2,165.72 and 712.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.36 : 2,165.72 = 712.54 : x
2. Step 2: Convert to fraction form
   1,443.36/2,165.72 = 712.54/x
3. Step 3: Cross multiply
   1,443.36x = 2,165.72 × 712.54
4. Step 4: Simplify right side
   1,443.36x = 1,543,162.13
5. Step 5: Solve for x
   x = 1,543,162.13/1,443.36
6. Step 6: Final answer
   x = 1,069.15