Finding the Fourth Proportional to 1,320.80, 1,822.72 and 731.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.80 : 1,822.72 = 731.32 : x
2. Step 2: Convert to fraction form
   1,320.80/1,822.72 = 731.32/x
3. Step 3: Cross multiply
   1,320.80x = 1,822.72 × 731.32
4. Step 4: Simplify right side
   1,320.80x = 1,332,991.59
5. Step 5: Solve for x
   x = 1,332,991.59/1,320.80
6. Step 6: Final answer
   x = 1,009.23