Finding the Fourth Proportional to 2,862.63, 3,929.34 and 2,540.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,862.63 : 3,929.34 = 2,540.79 : x
2. Step 2: Convert to fraction form
   2,862.63/3,929.34 = 2,540.79/x
3. Step 3: Cross multiply
   2,862.63x = 3,929.34 × 2,540.79
4. Step 4: Simplify right side
   2,862.63x = 9,983,627.78
5. Step 5: Solve for x
   x = 9,983,627.78/2,862.63
6. Step 6: Final answer
   x = 3,487.57