Finding the Fourth Proportional to 2,714.28, 4,071.32 and 865.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,714.28 : 4,071.32 = 865.50 : x
2. Step 2: Convert to fraction form
   2,714.28/4,071.32 = 865.50/x
3. Step 3: Cross multiply
   2,714.28x = 4,071.32 × 865.50
4. Step 4: Simplify right side
   2,714.28x = 3,523,702.78
5. Step 5: Solve for x
   x = 3,523,702.78/2,714.28
6. Step 6: Final answer
   x = 1,298.21