Finding the Fourth Proportional to 1,222.93, 1,687.69 and 692.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.93 : 1,687.69 = 692.02 : x
2. Step 2: Convert to fraction form
   1,222.93/1,687.69 = 692.02/x
3. Step 3: Cross multiply
   1,222.93x = 1,687.69 × 692.02
4. Step 4: Simplify right side
   1,222.93x = 1,167,915.23
5. Step 5: Solve for x
   x = 1,167,915.23/1,222.93
6. Step 6: Final answer
   x = 955.01