Finding the Fourth Proportional to 1,166.31, 1,609.37 and 668.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,166.31 : 1,609.37 = 668.84 : x
2. Step 2: Convert to fraction form
   1,166.31/1,609.37 = 668.84/x
3. Step 3: Cross multiply
   1,166.31x = 1,609.37 × 668.84
4. Step 4: Simplify right side
   1,166.31x = 1,076,402.15
5. Step 5: Solve for x
   x = 1,076,402.15/1,166.31
6. Step 6: Final answer
   x = 922.91