Finding the Fourth Proportional to 2,098.85, 3,148.28 and 638.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.85 : 3,148.28 = 638.00 : x
2. Step 2: Convert to fraction form
   2,098.85/3,148.28 = 638.00/x
3. Step 3: Cross multiply
   2,098.85x = 3,148.28 × 638.00
4. Step 4: Simplify right side
   2,098.85x = 2,008,583.71
5. Step 5: Solve for x
   x = 2,008,583.71/2,098.85
6. Step 6: Final answer
   x = 956.99