Finding the Fourth Proportional to 1,447.28, 1,997.28 and 817.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.28 : 1,997.28 = 817.76 : x
2. Step 2: Convert to fraction form
   1,447.28/1,997.28 = 817.76/x
3. Step 3: Cross multiply
   1,447.28x = 1,997.28 × 817.76
4. Step 4: Simplify right side
   1,447.28x = 1,633,295.69
5. Step 5: Solve for x
   x = 1,633,295.69/1,447.28
6. Step 6: Final answer
   x = 1,128.53