Finding the Fourth Proportional to 2,851.79, 3,940.91 and 2,057.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,851.79 : 3,940.91 = 2,057.72 : x
2. Step 2: Convert to fraction form
   2,851.79/3,940.91 = 2,057.72/x
3. Step 3: Cross multiply
   2,851.79x = 3,940.91 × 2,057.72
4. Step 4: Simplify right side
   2,851.79x = 8,109,259.33
5. Step 5: Solve for x
   x = 8,109,259.33/2,851.79
6. Step 6: Final answer
   x = 2,843.57