Finding the Fourth Proportional to 1,553.72, 2,144.34 and 890.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.72 : 2,144.34 = 890.60 : x
2. Step 2: Convert to fraction form
   1,553.72/2,144.34 = 890.60/x
3. Step 3: Cross multiply
   1,553.72x = 2,144.34 × 890.60
4. Step 4: Simplify right side
   1,553.72x = 1,909,738.48
5. Step 5: Solve for x
   x = 1,909,738.48/1,553.72
6. Step 6: Final answer
   x = 1,229.14