Finding the Fourth Proportional to 1,222.84, 1,687.53 and 698.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.84 : 1,687.53 = 698.89 : x
2. Step 2: Convert to fraction form
   1,222.84/1,687.53 = 698.89/x
3. Step 3: Cross multiply
   1,222.84x = 1,687.53 × 698.89
4. Step 4: Simplify right side
   1,222.84x = 1,179,397.84
5. Step 5: Solve for x
   x = 1,179,397.84/1,222.84
6. Step 6: Final answer
   x = 964.47