Finding the Fourth Proportional to 1,456.28, 2,179.54 and 879.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.28 : 2,179.54 = 879.56 : x
2. Step 2: Convert to fraction form
   1,456.28/2,179.54 = 879.56/x
3. Step 3: Cross multiply
   1,456.28x = 2,179.54 × 879.56
4. Step 4: Simplify right side
   1,456.28x = 1,917,036.20
5. Step 5: Solve for x
   x = 1,917,036.20/1,456.28
6. Step 6: Final answer
   x = 1,316.39