Finding the Fourth Proportional to 2,159.28, 2,979.78 and 1,227.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.28 : 2,979.78 = 1,227.72 : x
2. Step 2: Convert to fraction form
   2,159.28/2,979.78 = 1,227.72/x
3. Step 3: Cross multiply
   2,159.28x = 2,979.78 × 1,227.72
4. Step 4: Simplify right side
   2,159.28x = 3,658,335.50
5. Step 5: Solve for x
   x = 3,658,335.50/2,159.28
6. Step 6: Final answer
   x = 1,694.24