Finding the Fourth Proportional to 3,557.72, 5,335.85 and 960.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,557.72 : 5,335.85 = 960.05 : x
2. Step 2: Convert to fraction form
   3,557.72/5,335.85 = 960.05/x
3. Step 3: Cross multiply
   3,557.72x = 5,335.85 × 960.05
4. Step 4: Simplify right side
   3,557.72x = 5,122,651.31
5. Step 5: Solve for x
   x = 5,122,651.31/3,557.72
6. Step 6: Final answer
   x = 1,439.87