Finding the Fourth Proportional to 1,165.89, 1,608.96 and 668.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.89 : 1,608.96 = 668.61 : x
2. Step 2: Convert to fraction form
   1,165.89/1,608.96 = 668.61/x
3. Step 3: Cross multiply
   1,165.89x = 1,608.96 × 668.61
4. Step 4: Simplify right side
   1,165.89x = 1,075,766.75
5. Step 5: Solve for x
   x = 1,075,766.75/1,165.89
6. Step 6: Final answer
   x = 922.70