Finding the Fourth Proportional to 1,162.31, 1,604.00 and 638.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.31 : 1,604.00 = 638.36 : x
2. Step 2: Convert to fraction form
   1,162.31/1,604.00 = 638.36/x
3. Step 3: Cross multiply
   1,162.31x = 1,604.00 × 638.36
4. Step 4: Simplify right side
   1,162.31x = 1,023,923.02
5. Step 5: Solve for x
   x = 1,023,923.02/1,162.31
6. Step 6: Final answer
   x = 880.94