Finding the Fourth Proportional to 2,279.16, 3,144.40 and 1,439.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.16 : 3,144.40 = 1,439.96 : x
2. Step 2: Convert to fraction form
   2,279.16/3,144.40 = 1,439.96/x
3. Step 3: Cross multiply
   2,279.16x = 3,144.40 × 1,439.96
4. Step 4: Simplify right side
   2,279.16x = 4,527,810.22
5. Step 5: Solve for x
   x = 4,527,810.22/2,279.16
6. Step 6: Final answer
   x = 1,986.61