Finding the Fourth Proportional to 1,057.27, 1,455.72 and 960.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.27 : 1,455.72 = 960.07 : x
2. Step 2: Convert to fraction form
   1,057.27/1,455.72 = 960.07/x
3. Step 3: Cross multiply
   1,057.27x = 1,455.72 × 960.07
4. Step 4: Simplify right side
   1,057.27x = 1,397,593.10
5. Step 5: Solve for x
   x = 1,397,593.10/1,057.27
6. Step 6: Final answer
   x = 1,321.89