Finding the Fourth Proportional to 1,178.86, 1,626.78 and 681.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178.86 : 1,626.78 = 681.42 : x
2. Step 2: Convert to fraction form
   1,178.86/1,626.78 = 681.42/x
3. Step 3: Cross multiply
   1,178.86x = 1,626.78 × 681.42
4. Step 4: Simplify right side
   1,178.86x = 1,108,520.43
5. Step 5: Solve for x
   x = 1,108,520.43/1,178.86
6. Step 6: Final answer
   x = 940.33