Finding the Fourth Proportional to 1,553.96, 2,144.52 and 890.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.96 : 2,144.52 = 890.84 : x
2. Step 2: Convert to fraction form
   1,553.96/2,144.52 = 890.84/x
3. Step 3: Cross multiply
   1,553.96x = 2,144.52 × 890.84
4. Step 4: Simplify right side
   1,553.96x = 1,910,424.20
5. Step 5: Solve for x
   x = 1,910,424.20/1,553.96
6. Step 6: Final answer
   x = 1,229.39