Finding the Fourth Proportional to 2,158.89, 2,979.27 and 1,227.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.89 : 2,979.27 = 1,227.39 : x
2. Step 2: Convert to fraction form
   2,158.89/2,979.27 = 1,227.39/x
3. Step 3: Cross multiply
   2,158.89x = 2,979.27 × 1,227.39
4. Step 4: Simplify right side
   2,158.89x = 3,656,726.21
5. Step 5: Solve for x
   x = 3,656,726.21/2,158.89
6. Step 6: Final answer
   x = 1,693.80