Finding the Fourth Proportional to 1,456.28, 2,009.16 and 984.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.28 : 2,009.16 = 984.80 : x
2. Step 2: Convert to fraction form
   1,456.28/2,009.16 = 984.80/x
3. Step 3: Cross multiply
   1,456.28x = 2,009.16 × 984.80
4. Step 4: Simplify right side
   1,456.28x = 1,978,620.77
5. Step 5: Solve for x
   x = 1,978,620.77/1,456.28
6. Step 6: Final answer
   x = 1,358.68