Finding the Fourth Proportional to 1,222.47, 1,686.74 and 725.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.47 : 1,686.74 = 725.27 : x
2. Step 2: Convert to fraction form
   1,222.47/1,686.74 = 725.27/x
3. Step 3: Cross multiply
   1,222.47x = 1,686.74 × 725.27
4. Step 4: Simplify right side
   1,222.47x = 1,223,329.86
5. Step 5: Solve for x
   x = 1,223,329.86/1,222.47
6. Step 6: Final answer
   x = 1,000.70