Finding the Fourth Proportional to 2,519.78, 3,779.24 and 959.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,519.78 : 3,779.24 = 959.72 : x
2. Step 2: Convert to fraction form
   2,519.78/3,779.24 = 959.72/x
3. Step 3: Cross multiply
   2,519.78x = 3,779.24 × 959.72
4. Step 4: Simplify right side
   2,519.78x = 3,626,988.52
5. Step 5: Solve for x
   x = 3,626,988.52/2,519.78
6. Step 6: Final answer
   x = 1,439.41