Finding the Fourth Proportional to 2,686.78, 4,028.36 and 1,371

Step by Step Solution

1. Step 1: Write the proportion equation
   2,686.78 : 4,028.36 = 1,371 : x
2. Step 2: Convert to fraction form
   2,686.78/4,028.36 = 1,371/x
3. Step 3: Cross multiply
   2,686.78x = 4,028.36 × 1,371
4. Step 4: Simplify right side
   2,686.78x = 5,522,881.56
5. Step 5: Solve for x
   x = 5,522,881.56/2,686.78
6. Step 6: Final answer
   x = 2,055.58