Finding the Fourth Proportional to 2,672.10, 4,003.05 and 1,439.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.10 : 4,003.05 = 1,439.10 : x
2. Step 2: Convert to fraction form
   2,672.10/4,003.05 = 1,439.10/x
3. Step 3: Cross multiply
   2,672.10x = 4,003.05 × 1,439.10
4. Step 4: Simplify right side
   2,672.10x = 5,760,789.26
5. Step 5: Solve for x
   x = 5,760,789.26/2,672.10
6. Step 6: Final answer
   x = 2,155.90