Finding the Fourth Proportional to 1,166.20, 1,609.31 and 668.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.20 : 1,609.31 = 668.49 : x
2. Step 2: Convert to fraction form
   1,166.20/1,609.31 = 668.49/x
3. Step 3: Cross multiply
   1,166.20x = 1,609.31 × 668.49
4. Step 4: Simplify right side
   1,166.20x = 1,075,810.33
5. Step 5: Solve for x
   x = 1,075,810.33/1,166.20
6. Step 6: Final answer
   x = 922.49