Finding the Fourth Proportional to 1,165.86, 1,609.00 and 668.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.86 : 1,609.00 = 668.79 : x
2. Step 2: Convert to fraction form
   1,165.86/1,609.00 = 668.79/x
3. Step 3: Cross multiply
   1,165.86x = 1,609.00 × 668.79
4. Step 4: Simplify right side
   1,165.86x = 1,076,081.44
5. Step 5: Solve for x
   x = 1,076,081.44/1,165.86
6. Step 6: Final answer
   x = 922.99