Finding the Fourth Proportional to 1,222.62, 1,686.81 and 725.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.62 : 1,686.81 = 725.34 : x
2. Step 2: Convert to fraction form
   1,222.62/1,686.81 = 725.34/x
3. Step 3: Cross multiply
   1,222.62x = 1,686.81 × 725.34
4. Step 4: Simplify right side
   1,222.62x = 1,223,510.77
5. Step 5: Solve for x
   x = 1,223,510.77/1,222.62
6. Step 6: Final answer
   x = 1,000.73