Finding the Fourth Proportional to 3,168.32, 4,747.28 and 1,087.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,168.32 : 4,747.28 = 1,087.20 : x
2. Step 2: Convert to fraction form
   3,168.32/4,747.28 = 1,087.20/x
3. Step 3: Cross multiply
   3,168.32x = 4,747.28 × 1,087.20
4. Step 4: Simplify right side
   3,168.32x = 5,161,237.38
5. Step 5: Solve for x
   x = 5,161,237.38/3,168.32
6. Step 6: Final answer
   x = 1,629.02