Finding the Fourth Proportional to 1,178.72, 1,626.69 and 681.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178.72 : 1,626.69 = 681.43 : x
2. Step 2: Convert to fraction form
   1,178.72/1,626.69 = 681.43/x
3. Step 3: Cross multiply
   1,178.72x = 1,626.69 × 681.43
4. Step 4: Simplify right side
   1,178.72x = 1,108,475.37
5. Step 5: Solve for x
   x = 1,108,475.37/1,178.72
6. Step 6: Final answer
   x = 940.41