Finding the Fourth Proportional to 2,098.82, 3,148.23 and 638.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.82 : 3,148.23 = 638.09 : x
2. Step 2: Convert to fraction form
   2,098.82/3,148.23 = 638.09/x
3. Step 3: Cross multiply
   2,098.82x = 3,148.23 × 638.09
4. Step 4: Simplify right side
   2,098.82x = 2,008,835.15
5. Step 5: Solve for x
   x = 2,008,835.15/2,098.82
6. Step 6: Final answer
   x = 957.13