Finding the Fourth Proportional to 1,171.51, 1,616.69 and 674.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.51 : 1,616.69 = 674.28 : x
2. Step 2: Convert to fraction form
   1,171.51/1,616.69 = 674.28/x
3. Step 3: Cross multiply
   1,171.51x = 1,616.69 × 674.28
4. Step 4: Simplify right side
   1,171.51x = 1,090,103.42
5. Step 5: Solve for x
   x = 1,090,103.42/1,171.51
6. Step 6: Final answer
   x = 930.51