Finding the Fourth Proportional to 1,447.37, 1,997.22 and 817.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.37 : 1,997.22 = 817.80 : x
2. Step 2: Convert to fraction form
   1,447.37/1,997.22 = 817.80/x
3. Step 3: Cross multiply
   1,447.37x = 1,997.22 × 817.80
4. Step 4: Simplify right side
   1,447.37x = 1,633,322.09
5. Step 5: Solve for x
   x = 1,633,322.09/1,447.37
6. Step 6: Final answer
   x = 1,128.48