Finding the Fourth Proportional to 2,158.72, 2,979.06 and 1,227.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.72 : 2,979.06 = 1,227.28 : x
2. Step 2: Convert to fraction form
   2,158.72/2,979.06 = 1,227.28/x
3. Step 3: Cross multiply
   2,158.72x = 2,979.06 × 1,227.28
4. Step 4: Simplify right side
   2,158.72x = 3,656,140.76
5. Step 5: Solve for x
   x = 3,656,140.76/2,158.72
6. Step 6: Final answer
   x = 1,693.66