Finding the Fourth Proportional to 1,162.71, 1,604.52 and 638.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.71 : 1,604.52 = 638.73 : x
2. Step 2: Convert to fraction form
   1,162.71/1,604.52 = 638.73/x
3. Step 3: Cross multiply
   1,162.71x = 1,604.52 × 638.73
4. Step 4: Simplify right side
   1,162.71x = 1,024,855.06
5. Step 5: Solve for x
   x = 1,024,855.06/1,162.71
6. Step 6: Final answer
   x = 881.44