Finding the Fourth Proportional to 1,162.25, 1,603.91 and 638.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.25 : 1,603.91 = 638.27 : x
2. Step 2: Convert to fraction form
   1,162.25/1,603.91 = 638.27/x
3. Step 3: Cross multiply
   1,162.25x = 1,603.91 × 638.27
4. Step 4: Simplify right side
   1,162.25x = 1,023,724.44
5. Step 5: Solve for x
   x = 1,023,724.44/1,162.25
6. Step 6: Final answer
   x = 880.81