Finding the Fourth Proportional to 1,446.80, 1,996.57 and 817.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,446.80 : 1,996.57 = 817.31 : x
2. Step 2: Convert to fraction form
   1,446.80/1,996.57 = 817.31/x
3. Step 3: Cross multiply
   1,446.80x = 1,996.57 × 817.31
4. Step 4: Simplify right side
   1,446.80x = 1,631,819.57
5. Step 5: Solve for x
   x = 1,631,819.57/1,446.80
6. Step 6: Final answer
   x = 1,127.89