Finding the Fourth Proportional to 1,223.10, 1,687.82 and 692.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.10 : 1,687.82 = 692.01 : x
2. Step 2: Convert to fraction form
   1,223.10/1,687.82 = 692.01/x
3. Step 3: Cross multiply
   1,223.10x = 1,687.82 × 692.01
4. Step 4: Simplify right side
   1,223.10x = 1,167,984.86
5. Step 5: Solve for x
   x = 1,167,984.86/1,223.10
6. Step 6: Final answer
   x = 954.94