Finding the Fourth Proportional to 1,222.52, 1,686.89 and 698.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.52 : 1,686.89 = 698.45 : x
2. Step 2: Convert to fraction form
   1,222.52/1,686.89 = 698.45/x
3. Step 3: Cross multiply
   1,222.52x = 1,686.89 × 698.45
4. Step 4: Simplify right side
   1,222.52x = 1,178,201.63
5. Step 5: Solve for x
   x = 1,178,201.63/1,222.52
6. Step 6: Final answer
   x = 963.75