Finding the Fourth Proportional to 2,856.22, 4,285.71 and 2,486.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.22 : 4,285.71 = 2,486.72 : x
2. Step 2: Convert to fraction form
   2,856.22/4,285.71 = 2,486.72/x
3. Step 3: Cross multiply
   2,856.22x = 4,285.71 × 2,486.72
4. Step 4: Simplify right side
   2,856.22x = 10,657,371.49
5. Step 5: Solve for x
   x = 10,657,371.49/2,856.22
6. Step 6: Final answer
   x = 3,731.29