Finding the Fourth Proportional to 1,171.68, 1,616.91 and 674.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.68 : 1,616.91 = 674.31 : x
2. Step 2: Convert to fraction form
   1,171.68/1,616.91 = 674.31/x
3. Step 3: Cross multiply
   1,171.68x = 1,616.91 × 674.31
4. Step 4: Simplify right side
   1,171.68x = 1,090,298.58
5. Step 5: Solve for x
   x = 1,090,298.58/1,171.68
6. Step 6: Final answer
   x = 930.54