Finding the Fourth Proportional to 2,098.98, 3,148.56 and 638.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.98 : 3,148.56 = 638.15 : x
2. Step 2: Convert to fraction form
   2,098.98/3,148.56 = 638.15/x
3. Step 3: Cross multiply
   2,098.98x = 3,148.56 × 638.15
4. Step 4: Simplify right side
   2,098.98x = 2,009,237.82
5. Step 5: Solve for x
   x = 2,009,237.82/2,098.98
6. Step 6: Final answer
   x = 957.24