Finding the Fourth Proportional to 1,447.09, 1,996.80 and 817.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.09 : 1,996.80 = 817.57 : x
2. Step 2: Convert to fraction form
   1,447.09/1,996.80 = 817.57/x
3. Step 3: Cross multiply
   1,447.09x = 1,996.80 × 817.57
4. Step 4: Simplify right side
   1,447.09x = 1,632,523.78
5. Step 5: Solve for x
   x = 1,632,523.78/1,447.09
6. Step 6: Final answer
   x = 1,128.14