Finding the Fourth Proportional to 2,099.43, 3,148.93 and 638.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.43 : 3,148.93 = 638.59 : x
2. Step 2: Convert to fraction form
   2,099.43/3,148.93 = 638.59/x
3. Step 3: Cross multiply
   2,099.43x = 3,148.93 × 638.59
4. Step 4: Simplify right side
   2,099.43x = 2,010,872.02
5. Step 5: Solve for x
   x = 2,010,872.02/2,099.43
6. Step 6: Final answer
   x = 957.82