Finding the Fourth Proportional to 1,223.59, 1,688.37 and 692.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.59 : 1,688.37 = 692.38 : x
2. Step 2: Convert to fraction form
   1,223.59/1,688.37 = 692.38/x
3. Step 3: Cross multiply
   1,223.59x = 1,688.37 × 692.38
4. Step 4: Simplify right side
   1,223.59x = 1,168,993.62
5. Step 5: Solve for x
   x = 1,168,993.62/1,223.59
6. Step 6: Final answer
   x = 955.38