Finding the Fourth Proportional to 2,160.72, 2,981.82 and 1,229.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.72 : 2,981.82 = 1,229.28 : x
2. Step 2: Convert to fraction form
   2,160.72/2,981.82 = 1,229.28/x
3. Step 3: Cross multiply
   2,160.72x = 2,981.82 × 1,229.28
4. Step 4: Simplify right side
   2,160.72x = 3,665,491.69
5. Step 5: Solve for x
   x = 3,665,491.69/2,160.72
6. Step 6: Final answer
   x = 1,696.42