Finding the Fourth Proportional to 1,364.72, 2,042.04 and 817.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,364.72 : 2,042.04 = 817.28 : x
2. Step 2: Convert to fraction form
   1,364.72/2,042.04 = 817.28/x
3. Step 3: Cross multiply
   1,364.72x = 2,042.04 × 817.28
4. Step 4: Simplify right side
   1,364.72x = 1,668,918.45
5. Step 5: Solve for x
   x = 1,668,918.45/1,364.72
6. Step 6: Final answer
   x = 1,222.90