Finding the Fourth Proportional to 2,478.59, 3,719.23 and 1,439.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.59 : 3,719.23 = 1,439.34 : x
2. Step 2: Convert to fraction form
   2,478.59/3,719.23 = 1,439.34/x
3. Step 3: Cross multiply
   2,478.59x = 3,719.23 × 1,439.34
4. Step 4: Simplify right side
   2,478.59x = 5,353,236.51
5. Step 5: Solve for x
   x = 5,353,236.51/2,478.59
6. Step 6: Final answer
   x = 2,159.79