Finding the Fourth Proportional to 1,223.82, 1,688.67 and 692.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.82 : 1,688.67 = 692.55 : x
2. Step 2: Convert to fraction form
   1,223.82/1,688.67 = 692.55/x
3. Step 3: Cross multiply
   1,223.82x = 1,688.67 × 692.55
4. Step 4: Simplify right side
   1,223.82x = 1,169,488.41
5. Step 5: Solve for x
   x = 1,169,488.41/1,223.82
6. Step 6: Final answer
   x = 955.60