Finding the Fourth Proportional to 1,165.72, 1,608.78 and 668.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.72 : 1,608.78 = 668.38 : x
2. Step 2: Convert to fraction form
   1,165.72/1,608.78 = 668.38/x
3. Step 3: Cross multiply
   1,165.72x = 1,608.78 × 668.38
4. Step 4: Simplify right side
   1,165.72x = 1,075,276.38
5. Step 5: Solve for x
   x = 1,075,276.38/1,165.72
6. Step 6: Final answer
   x = 922.41