Finding the Fourth Proportional to 2,854.84, 4,279.28 and 1,391.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,854.84 : 4,279.28 = 1,391.98 : x
2. Step 2: Convert to fraction form
   2,854.84/4,279.28 = 1,391.98/x
3. Step 3: Cross multiply
   2,854.84x = 4,279.28 × 1,391.98
4. Step 4: Simplify right side
   2,854.84x = 5,956,672.17
5. Step 5: Solve for x
   x = 5,956,672.17/2,854.84
6. Step 6: Final answer
   x = 2,086.52