Finding the Fourth Proportional to 2,098.98, 3,147.93 and 638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.98 : 3,147.93 = 638.10 : x
2. Step 2: Convert to fraction form
   2,098.98/3,147.93 = 638.10/x
3. Step 3: Cross multiply
   2,098.98x = 3,147.93 × 638.10
4. Step 4: Simplify right side
   2,098.98x = 2,008,694.13
5. Step 5: Solve for x
   x = 2,008,694.13/2,098.98
6. Step 6: Final answer
   x = 956.99