Finding the Fourth Proportional to 2,099.34, 3,149 and 638.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.34 : 3,149 = 638.50 : x
2. Step 2: Convert to fraction form
   2,099.34/3,149 = 638.50/x
3. Step 3: Cross multiply
   2,099.34x = 3,149 × 638.50
4. Step 4: Simplify right side
   2,099.34x = 2,010,636.50
5. Step 5: Solve for x
   x = 2,010,636.50/2,099.34
6. Step 6: Final answer
   x = 957.75