Finding the Fourth Proportional to 1,222.46, 1,686.96 and 698.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.46 : 1,686.96 = 698.48 : x
2. Step 2: Convert to fraction form
   1,222.46/1,686.96 = 698.48/x
3. Step 3: Cross multiply
   1,222.46x = 1,686.96 × 698.48
4. Step 4: Simplify right side
   1,222.46x = 1,178,307.82
5. Step 5: Solve for x
   x = 1,178,307.82/1,222.46
6. Step 6: Final answer
   x = 963.88