Finding the Fourth Proportional to 2,155.59, 2,974.72 and 1,224.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.59 : 2,974.72 = 1,224.09 : x
2. Step 2: Convert to fraction form
   2,155.59/2,974.72 = 1,224.09/x
3. Step 3: Cross multiply
   2,155.59x = 2,974.72 × 1,224.09
4. Step 4: Simplify right side
   2,155.59x = 3,641,339.99
5. Step 5: Solve for x
   x = 3,641,339.99/2,155.59
6. Step 6: Final answer
   x = 1,689.25