Finding the Fourth Proportional to 1,443.69, 1,991.99 and 884.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.69 : 1,991.99 = 884.28 : x
2. Step 2: Convert to fraction form
   1,443.69/1,991.99 = 884.28/x
3. Step 3: Cross multiply
   1,443.69x = 1,991.99 × 884.28
4. Step 4: Simplify right side
   1,443.69x = 1,761,486.60
5. Step 5: Solve for x
   x = 1,761,486.60/1,443.69
6. Step 6: Final answer
   x = 1,220.13