Finding the Fourth Proportional to 1,553.22, 2,142.98 and 923.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.22 : 2,142.98 = 923.43 : x
2. Step 2: Convert to fraction form
   1,553.22/2,142.98 = 923.43/x
3. Step 3: Cross multiply
   1,553.22x = 2,142.98 × 923.43
4. Step 4: Simplify right side
   1,553.22x = 1,978,876.69
5. Step 5: Solve for x
   x = 1,978,876.69/1,553.22
6. Step 6: Final answer
   x = 1,274.05