Finding the Fourth Proportional to 1,447.04, 1,996.96 and 817.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.04 : 1,996.96 = 817.60 : x
2. Step 2: Convert to fraction form
   1,447.04/1,996.96 = 817.60/x
3. Step 3: Cross multiply
   1,447.04x = 1,996.96 × 817.60
4. Step 4: Simplify right side
   1,447.04x = 1,632,714.50
5. Step 5: Solve for x
   x = 1,632,714.50/1,447.04
6. Step 6: Final answer
   x = 1,128.31