Finding the Fourth Proportional to 1,165.62, 1,608.42 and 668.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.62 : 1,608.42 = 668.31 : x
2. Step 2: Convert to fraction form
   1,165.62/1,608.42 = 668.31/x
3. Step 3: Cross multiply
   1,165.62x = 1,608.42 × 668.31
4. Step 4: Simplify right side
   1,165.62x = 1,074,923.17
5. Step 5: Solve for x
   x = 1,074,923.17/1,165.62
6. Step 6: Final answer
   x = 922.19