Finding the Fourth Proportional to 1,223.54, 1,688.52 and 726.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.54 : 1,688.52 = 726.18 : x
2. Step 2: Convert to fraction form
   1,223.54/1,688.52 = 726.18/x
3. Step 3: Cross multiply
   1,223.54x = 1,688.52 × 726.18
4. Step 4: Simplify right side
   1,223.54x = 1,226,169.45
5. Step 5: Solve for x
   x = 1,226,169.45/1,223.54
6. Step 6: Final answer
   x = 1,002.15