Finding the Fourth Proportional to 2,158.72, 2,978.76 and 1,227.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.72 : 2,978.76 = 1,227.24 : x
2. Step 2: Convert to fraction form
   2,158.72/2,978.76 = 1,227.24/x
3. Step 3: Cross multiply
   2,158.72x = 2,978.76 × 1,227.24
4. Step 4: Simplify right side
   2,158.72x = 3,655,653.42
5. Step 5: Solve for x
   x = 3,655,653.42/2,158.72
6. Step 6: Final answer
   x = 1,693.44