Finding the Fourth Proportional to 2,155.43, 2,974.49 and 1,223.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.43 : 2,974.49 = 1,223.93 : x
2. Step 2: Convert to fraction form
   2,155.43/2,974.49 = 1,223.93/x
3. Step 3: Cross multiply
   2,155.43x = 2,974.49 × 1,223.93
4. Step 4: Simplify right side
   2,155.43x = 3,640,546.55
5. Step 5: Solve for x
   x = 3,640,546.55/2,155.43
6. Step 6: Final answer
   x = 1,689.02