Finding the Fourth Proportional to 2,487.69, 3,731.27 and 638.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.69 : 3,731.27 = 638.82 : x
2. Step 2: Convert to fraction form
   2,487.69/3,731.27 = 638.82/x
3. Step 3: Cross multiply
   2,487.69x = 3,731.27 × 638.82
4. Step 4: Simplify right side
   2,487.69x = 2,383,606.71
5. Step 5: Solve for x
   x = 2,383,606.71/2,487.69
6. Step 6: Final answer
   x = 958.16