Finding the Fourth Proportional to 2,838.88, 4,258.78 and 1,279.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,838.88 : 4,258.78 = 1,279.43 : x
2. Step 2: Convert to fraction form
   2,838.88/4,258.78 = 1,279.43/x
3. Step 3: Cross multiply
   2,838.88x = 4,258.78 × 1,279.43
4. Step 4: Simplify right side
   2,838.88x = 5,448,802.37
5. Step 5: Solve for x
   x = 5,448,802.37/2,838.88
6. Step 6: Final answer
   x = 1,919.35