Finding the Fourth Proportional to 1,222.16, 1,686.42 and 698.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.16 : 1,686.42 = 698.22 : x
2. Step 2: Convert to fraction form
   1,222.16/1,686.42 = 698.22/x
3. Step 3: Cross multiply
   1,222.16x = 1,686.42 × 698.22
4. Step 4: Simplify right side
   1,222.16x = 1,177,492.17
5. Step 5: Solve for x
   x = 1,177,492.17/1,222.16
6. Step 6: Final answer
   x = 963.46