Finding the Fourth Proportional to 1,553.06, 2,143.43 and 889.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.06 : 2,143.43 = 889.98 : x
2. Step 2: Convert to fraction form
   1,553.06/2,143.43 = 889.98/x
3. Step 3: Cross multiply
   1,553.06x = 2,143.43 × 889.98
4. Step 4: Simplify right side
   1,553.06x = 1,907,609.83
5. Step 5: Solve for x
   x = 1,907,609.83/1,553.06
6. Step 6: Final answer
   x = 1,228.29