Finding the Fourth Proportional to 1,222.05, 1,687.01 and 697.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.05 : 1,687.01 = 697.98 : x
2. Step 2: Convert to fraction form
   1,222.05/1,687.01 = 697.98/x
3. Step 3: Cross multiply
   1,222.05x = 1,687.01 × 697.98
4. Step 4: Simplify right side
   1,222.05x = 1,177,499.24
5. Step 5: Solve for x
   x = 1,177,499.24/1,222.05
6. Step 6: Final answer
   x = 963.54