Finding the Fourth Proportional to 1,553.42, 2,143.72 and 890.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.42 : 2,143.72 = 890.41 : x
2. Step 2: Convert to fraction form
   1,553.42/2,143.72 = 890.41/x
3. Step 3: Cross multiply
   1,553.42x = 2,143.72 × 890.41
4. Step 4: Simplify right side
   1,553.42x = 1,908,789.73
5. Step 5: Solve for x
   x = 1,908,789.73/1,553.42
6. Step 6: Final answer
   x = 1,228.77