Finding the Fourth Proportional to 1,554.18, 2,144.25 and 890.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.18 : 2,144.25 = 890.57 : x
2. Step 2: Convert to fraction form
   1,554.18/2,144.25 = 890.57/x
3. Step 3: Cross multiply
   1,554.18x = 2,144.25 × 890.57
4. Step 4: Simplify right side
   1,554.18x = 1,909,604.72
5. Step 5: Solve for x
   x = 1,909,604.72/1,554.18
6. Step 6: Final answer
   x = 1,228.69