Finding the Fourth Proportional to 2,112, 3,168.18 and 725.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112 : 3,168.18 = 725.28 : x
2. Step 2: Convert to fraction form
   2,112/3,168.18 = 725.28/x
3. Step 3: Cross multiply
   2,112x = 3,168.18 × 725.28
4. Step 4: Simplify right side
   2,112x = 2,297,817.59
5. Step 5: Solve for x
   x = 2,297,817.59/2,112
6. Step 6: Final answer
   x = 1,087.98