Finding the Fourth Proportional to 1,287.59, 1,776.84 and 728.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.59 : 1,776.84 = 728.04 : x
2. Step 2: Convert to fraction form
   1,287.59/1,776.84 = 728.04/x
3. Step 3: Cross multiply
   1,287.59x = 1,776.84 × 728.04
4. Step 4: Simplify right side
   1,287.59x = 1,293,610.59
5. Step 5: Solve for x
   x = 1,293,610.59/1,287.59
6. Step 6: Final answer
   x = 1,004.68