Finding the Fourth Proportional to 2,168.10, 2,992.17 and 1,223.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.10 : 2,992.17 = 1,223.88 : x
2. Step 2: Convert to fraction form
   2,168.10/2,992.17 = 1,223.88/x
3. Step 3: Cross multiply
   2,168.10x = 2,992.17 × 1,223.88
4. Step 4: Simplify right side
   2,168.10x = 3,662,057.02
5. Step 5: Solve for x
   x = 3,662,057.02/2,168.10
6. Step 6: Final answer
   x = 1,689.06