Finding the Fourth Proportional to 1,067.72, 1,601.46 and 287.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,067.72 : 1,601.46 = 287.69 : x
2. Step 2: Convert to fraction form
   1,067.72/1,601.46 = 287.69/x
3. Step 3: Cross multiply
   1,067.72x = 1,601.46 × 287.69
4. Step 4: Simplify right side
   1,067.72x = 460,716.83
5. Step 5: Solve for x
   x = 460,716.83/1,067.72
6. Step 6: Final answer
   x = 431.50