Finding the Fourth Proportional to 3,426.72, 5,139.84 and 961.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,426.72 : 5,139.84 = 961.44 : x
2. Step 2: Convert to fraction form
   3,426.72/5,139.84 = 961.44/x
3. Step 3: Cross multiply
   3,426.72x = 5,139.84 × 961.44
4. Step 4: Simplify right side
   3,426.72x = 4,941,647.77
5. Step 5: Solve for x
   x = 4,941,647.77/3,426.72
6. Step 6: Final answer
   x = 1,442.09