Finding the Fourth Proportional to 3,556.91, 5,334.55 and 960.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,556.91 : 5,334.55 = 960.05 : x
2. Step 2: Convert to fraction form
   3,556.91/5,334.55 = 960.05/x
3. Step 3: Cross multiply
   3,556.91x = 5,334.55 × 960.05
4. Step 4: Simplify right side
   3,556.91x = 5,121,434.73
5. Step 5: Solve for x
   x = 5,121,434.73/3,556.91
6. Step 6: Final answer
   x = 1,439.86