Finding the Fourth Proportional to 1,222.27, 1,686.46 and 724.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.27 : 1,686.46 = 724.53 : x
2. Step 2: Convert to fraction form
   1,222.27/1,686.46 = 724.53/x
3. Step 3: Cross multiply
   1,222.27x = 1,686.46 × 724.53
4. Step 4: Simplify right side
   1,222.27x = 1,221,890.86
5. Step 5: Solve for x
   x = 1,221,890.86/1,222.27
6. Step 6: Final answer
   x = 999.69