Finding the Fourth Proportional to 2,078.20, 3,133.78 and 1,851.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.20 : 3,133.78 = 1,851.40 : x
2. Step 2: Convert to fraction form
   2,078.20/3,133.78 = 1,851.40/x
3. Step 3: Cross multiply
   2,078.20x = 3,133.78 × 1,851.40
4. Step 4: Simplify right side
   2,078.20x = 5,801,880.29
5. Step 5: Solve for x
   x = 5,801,880.29/2,078.20
6. Step 6: Final answer
   x = 2,791.78