Finding the Fourth Proportional to 1,162.24, 1,603.92 and 638.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.24 : 1,603.92 = 638.32 : x
2. Step 2: Convert to fraction form
   1,162.24/1,603.92 = 638.32/x
3. Step 3: Cross multiply
   1,162.24x = 1,603.92 × 638.32
4. Step 4: Simplify right side
   1,162.24x = 1,023,814.21
5. Step 5: Solve for x
   x = 1,023,814.21/1,162.24
6. Step 6: Final answer
   x = 880.90