Finding the Fourth Proportional to 1,222.92, 1,687.38 and 698.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.92 : 1,687.38 = 698.82 : x
2. Step 2: Convert to fraction form
   1,222.92/1,687.38 = 698.82/x
3. Step 3: Cross multiply
   1,222.92x = 1,687.38 × 698.82
4. Step 4: Simplify right side
   1,222.92x = 1,179,174.89
5. Step 5: Solve for x
   x = 1,179,174.89/1,222.92
6. Step 6: Final answer
   x = 964.23