Finding the Fourth Proportional to 2,168.57, 2,992.67 and 1,224.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.57 : 2,992.67 = 1,224.55 : x
2. Step 2: Convert to fraction form
   2,168.57/2,992.67 = 1,224.55/x
3. Step 3: Cross multiply
   2,168.57x = 2,992.67 × 1,224.55
4. Step 4: Simplify right side
   2,168.57x = 3,664,674.05
5. Step 5: Solve for x
   x = 3,664,674.05/2,168.57
6. Step 6: Final answer
   x = 1,689.90