Finding the Fourth Proportional to 1,165.31, 1,608.17 and 668.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.31 : 1,608.17 = 668.05 : x
2. Step 2: Convert to fraction form
   1,165.31/1,608.17 = 668.05/x
3. Step 3: Cross multiply
   1,165.31x = 1,608.17 × 668.05
4. Step 4: Simplify right side
   1,165.31x = 1,074,335.31
5. Step 5: Solve for x
   x = 1,074,335.31/1,165.31
6. Step 6: Final answer
   x = 921.93