Finding the Fourth Proportional to 1,112.72, 1,661.12 and 966.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.72 : 1,661.12 = 966.96 : x
2. Step 2: Convert to fraction form
   1,112.72/1,661.12 = 966.96/x
3. Step 3: Cross multiply
   1,112.72x = 1,661.12 × 966.96
4. Step 4: Simplify right side
   1,112.72x = 1,606,236.60
5. Step 5: Solve for x
   x = 1,606,236.60/1,112.72
6. Step 6: Final answer
   x = 1,443.52