Finding the Fourth Proportional to 2,158.72, 2,979.02 and 1,227.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.72 : 2,979.02 = 1,227.22 : x
2. Step 2: Convert to fraction form
   2,158.72/2,979.02 = 1,227.22/x
3. Step 3: Cross multiply
   2,158.72x = 2,979.02 × 1,227.22
4. Step 4: Simplify right side
   2,158.72x = 3,655,912.92
5. Step 5: Solve for x
   x = 3,655,912.92/2,158.72
6. Step 6: Final answer
   x = 1,693.56