Finding the Fourth Proportional to 2,099.89, 3,149.68 and 850.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.89 : 3,149.68 = 850.57 : x
2. Step 2: Convert to fraction form
   2,099.89/3,149.68 = 850.57/x
3. Step 3: Cross multiply
   2,099.89x = 3,149.68 × 850.57
4. Step 4: Simplify right side
   2,099.89x = 2,679,023.32
5. Step 5: Solve for x
   x = 2,679,023.32/2,099.89
6. Step 6: Final answer
   x = 1,275.79