Finding the Fourth Proportional to 2,155.27, 2,974.27 and 1,223.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.27 : 2,974.27 = 1,223.77 : x
2. Step 2: Convert to fraction form
   2,155.27/2,974.27 = 1,223.77/x
3. Step 3: Cross multiply
   2,155.27x = 2,974.27 × 1,223.77
4. Step 4: Simplify right side
   2,155.27x = 3,639,816.49
5. Step 5: Solve for x
   x = 3,639,816.49/2,155.27
6. Step 6: Final answer
   x = 1,688.80