Finding the Fourth Proportional to 1,162.69, 1,604.61 and 638.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.69 : 1,604.61 = 638.82 : x
2. Step 2: Convert to fraction form
   1,162.69/1,604.61 = 638.82/x
3. Step 3: Cross multiply
   1,162.69x = 1,604.61 × 638.82
4. Step 4: Simplify right side
   1,162.69x = 1,025,056.96
5. Step 5: Solve for x
   x = 1,025,056.96/1,162.69
6. Step 6: Final answer
   x = 881.63