Finding the Fourth Proportional to 2,098.87, 3,148.42 and 638.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.87 : 3,148.42 = 638.03 : x
2. Step 2: Convert to fraction form
   2,098.87/3,148.42 = 638.03/x
3. Step 3: Cross multiply
   2,098.87x = 3,148.42 × 638.03
4. Step 4: Simplify right side
   2,098.87x = 2,008,786.41
5. Step 5: Solve for x
   x = 2,008,786.41/2,098.87
6. Step 6: Final answer
   x = 957.08