Finding the Fourth Proportional to 1,055.28, 1,456.28 and 583.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.28 : 1,456.28 = 583.21 : x
2. Step 2: Convert to fraction form
   1,055.28/1,456.28 = 583.21/x
3. Step 3: Cross multiply
   1,055.28x = 1,456.28 × 583.21
4. Step 4: Simplify right side
   1,055.28x = 849,306.86
5. Step 5: Solve for x
   x = 849,306.86/1,055.28
6. Step 6: Final answer
   x = 804.82