Finding the Fourth Proportional to 2,155.50, 2,974.59 and 1,224

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.50 : 2,974.59 = 1,224 : x
2. Step 2: Convert to fraction form
   2,155.50/2,974.59 = 1,224/x
3. Step 3: Cross multiply
   2,155.50x = 2,974.59 × 1,224
4. Step 4: Simplify right side
   2,155.50x = 3,640,898.16
5. Step 5: Solve for x
   x = 3,640,898.16/2,155.50
6. Step 6: Final answer
   x = 1,689.12