Finding the Fourth Proportional to 1,442.28, 1,989.06 and 1,131.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.28 : 1,989.06 = 1,131.24 : x
2. Step 2: Convert to fraction form
   1,442.28/1,989.06 = 1,131.24/x
3. Step 3: Cross multiply
   1,442.28x = 1,989.06 × 1,131.24
4. Step 4: Simplify right side
   1,442.28x = 2,250,104.23
5. Step 5: Solve for x
   x = 2,250,104.23/1,442.28
6. Step 6: Final answer
   x = 1,560.10