Finding the Fourth Proportional to 1,288.36, 1,778.02 and 728.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.36 : 1,778.02 = 728.83 : x
2. Step 2: Convert to fraction form
   1,288.36/1,778.02 = 728.83/x
3. Step 3: Cross multiply
   1,288.36x = 1,778.02 × 728.83
4. Step 4: Simplify right side
   1,288.36x = 1,295,868.82
5. Step 5: Solve for x
   x = 1,295,868.82/1,288.36
6. Step 6: Final answer
   x = 1,005.83