Finding the Fourth Proportional to 1,048.23, 1,443.27 and 890.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,048.23 : 1,443.27 = 890.55 : x
2. Step 2: Convert to fraction form
   1,048.23/1,443.27 = 890.55/x
3. Step 3: Cross multiply
   1,048.23x = 1,443.27 × 890.55
4. Step 4: Simplify right side
   1,048.23x = 1,285,304.10
5. Step 5: Solve for x
   x = 1,285,304.10/1,048.23
6. Step 6: Final answer
   x = 1,226.17