Finding the Fourth Proportional to 2,099.49, 3,149.12 and 638.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.49 : 3,149.12 = 638.52 : x
2. Step 2: Convert to fraction form
   2,099.49/3,149.12 = 638.52/x
3. Step 3: Cross multiply
   2,099.49x = 3,149.12 × 638.52
4. Step 4: Simplify right side
   2,099.49x = 2,010,788.87
5. Step 5: Solve for x
   x = 2,010,788.87/2,099.49
6. Step 6: Final answer
   x = 957.75