Finding the Fourth Proportional to 2,155.72, 2,974.62 and 1,224.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.72 : 2,974.62 = 1,224.22 : x
2. Step 2: Convert to fraction form
   2,155.72/2,974.62 = 1,224.22/x
3. Step 3: Cross multiply
   2,155.72x = 2,974.62 × 1,224.22
4. Step 4: Simplify right side
   2,155.72x = 3,641,589.30
5. Step 5: Solve for x
   x = 3,641,589.30/2,155.72
6. Step 6: Final answer
   x = 1,689.27