Finding the Fourth Proportional to 2,099.35, 3,144.69 and 1,231.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.35 : 3,144.69 = 1,231.57 : x
2. Step 2: Convert to fraction form
   2,099.35/3,144.69 = 1,231.57/x
3. Step 3: Cross multiply
   2,099.35x = 3,144.69 × 1,231.57
4. Step 4: Simplify right side
   2,099.35x = 3,872,905.86
5. Step 5: Solve for x
   x = 3,872,905.86/2,099.35
6. Step 6: Final answer
   x = 1,844.81