Finding the Fourth Proportional to 1,324.72, 1,989.33 and 1,105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,324.72 : 1,989.33 = 1,105.12 : x
2. Step 2: Convert to fraction form
   1,324.72/1,989.33 = 1,105.12/x
3. Step 3: Cross multiply
   1,324.72x = 1,989.33 × 1,105.12
4. Step 4: Simplify right side
   1,324.72x = 2,198,448.37
5. Step 5: Solve for x
   x = 2,198,448.37/1,324.72
6. Step 6: Final answer
   x = 1,659.56