Finding the Fourth Proportional to 1,222.56, 1,686.54 and 724.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.56 : 1,686.54 = 724.96 : x
2. Step 2: Convert to fraction form
   1,222.56/1,686.54 = 724.96/x
3. Step 3: Cross multiply
   1,222.56x = 1,686.54 × 724.96
4. Step 4: Simplify right side
   1,222.56x = 1,222,674.04
5. Step 5: Solve for x
   x = 1,222,674.04/1,222.56
6. Step 6: Final answer
   x = 1,000.09