Finding the Fourth Proportional to 1,166.15, 1,609.41 and 668.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.15 : 1,609.41 = 668.69 : x
2. Step 2: Convert to fraction form
   1,166.15/1,609.41 = 668.69/x
3. Step 3: Cross multiply
   1,166.15x = 1,609.41 × 668.69
4. Step 4: Simplify right side
   1,166.15x = 1,076,196.37
5. Step 5: Solve for x
   x = 1,076,196.37/1,166.15
6. Step 6: Final answer
   x = 922.86