Finding the Fourth Proportional to 1,067.16, 1,603.86 and 885.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,067.16 : 1,603.86 = 885.72 : x
2. Step 2: Convert to fraction form
   1,067.16/1,603.86 = 885.72/x
3. Step 3: Cross multiply
   1,067.16x = 1,603.86 × 885.72
4. Step 4: Simplify right side
   1,067.16x = 1,420,570.88
5. Step 5: Solve for x
   x = 1,420,570.88/1,067.16
6. Step 6: Final answer
   x = 1,331.17