Finding the Fourth Proportional to 2,719.12, 4,049.88 and 2,686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.12 : 4,049.88 = 2,686.72 : x
2. Step 2: Convert to fraction form
   2,719.12/4,049.88 = 2,686.72/x
3. Step 3: Cross multiply
   2,719.12x = 4,049.88 × 2,686.72
4. Step 4: Simplify right side
   2,719.12x = 10,880,893.59
5. Step 5: Solve for x
   x = 10,880,893.59/2,719.12
6. Step 6: Final answer
   x = 4,001.62