Finding the Fourth Proportional to 1,223.27, 1,687.79 and 726.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.27 : 1,687.79 = 726.02 : x
2. Step 2: Convert to fraction form
   1,223.27/1,687.79 = 726.02/x
3. Step 3: Cross multiply
   1,223.27x = 1,687.79 × 726.02
4. Step 4: Simplify right side
   1,223.27x = 1,225,369.30
5. Step 5: Solve for x
   x = 1,225,369.30/1,223.27
6. Step 6: Final answer
   x = 1,001.72