Finding the Fourth Proportional to 1,123.47, 1,548.59 and 843.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.47 : 1,548.59 = 843.21 : x
2. Step 2: Convert to fraction form
   1,123.47/1,548.59 = 843.21/x
3. Step 3: Cross multiply
   1,123.47x = 1,548.59 × 843.21
4. Step 4: Simplify right side
   1,123.47x = 1,305,782.36
5. Step 5: Solve for x
   x = 1,305,782.36/1,123.47
6. Step 6: Final answer
   x = 1,162.28