Finding the Fourth Proportional to 1,171.05, 1,613.55 and 960.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.05 : 1,613.55 = 960.51 : x
2. Step 2: Convert to fraction form
   1,171.05/1,613.55 = 960.51/x
3. Step 3: Cross multiply
   1,171.05x = 1,613.55 × 960.51
4. Step 4: Simplify right side
   1,171.05x = 1,549,830.91
5. Step 5: Solve for x
   x = 1,549,830.91/1,171.05
6. Step 6: Final answer
   x = 1,323.45