Finding the Fourth Proportional to 2,579.10, 3,870 and 2,439.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,579.10 : 3,870 = 2,439.69 : x
2. Step 2: Convert to fraction form
   2,579.10/3,870 = 2,439.69/x
3. Step 3: Cross multiply
   2,579.10x = 3,870 × 2,439.69
4. Step 4: Simplify right side
   2,579.10x = 9,441,600.30
5. Step 5: Solve for x
   x = 9,441,600.30/2,579.10
6. Step 6: Final answer
   x = 3,660.81