Finding the Fourth Proportional to 1,162.13, 1,603.59 and 638.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.13 : 1,603.59 = 638.15 : x
2. Step 2: Convert to fraction form
   1,162.13/1,603.59 = 638.15/x
3. Step 3: Cross multiply
   1,162.13x = 1,603.59 × 638.15
4. Step 4: Simplify right side
   1,162.13x = 1,023,330.96
5. Step 5: Solve for x
   x = 1,023,330.96/1,162.13
6. Step 6: Final answer
   x = 880.56