Finding the Fourth Proportional to 1,447.15, 1,997.15 and 817.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.15 : 1,997.15 = 817.71 : x
2. Step 2: Convert to fraction form
   1,447.15/1,997.15 = 817.71/x
3. Step 3: Cross multiply
   1,447.15x = 1,997.15 × 817.71
4. Step 4: Simplify right side
   1,447.15x = 1,633,077.95
5. Step 5: Solve for x
   x = 1,633,077.95/1,447.15
6. Step 6: Final answer
   x = 1,128.48