Finding the Fourth Proportional to 3,086.71, 4,258.57 and 2,142.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086.71 : 4,258.57 = 2,142.25 : x
2. Step 2: Convert to fraction form
   3,086.71/4,258.57 = 2,142.25/x
3. Step 3: Cross multiply
   3,086.71x = 4,258.57 × 2,142.25
4. Step 4: Simplify right side
   3,086.71x = 9,122,921.58
5. Step 5: Solve for x
   x = 9,122,921.58/3,086.71
6. Step 6: Final answer
   x = 2,955.55