Finding the Fourth Proportional to 3,168.28, 4,754.22 and 2,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,168.28 : 4,754.22 = 2,128.78 : x
2. Step 2: Convert to fraction form
   3,168.28/4,754.22 = 2,128.78/x
3. Step 3: Cross multiply
   3,168.28x = 4,754.22 × 2,128.78
4. Step 4: Simplify right side
   3,168.28x = 10,120,688.45
5. Step 5: Solve for x
   x = 10,120,688.45/3,168.28
6. Step 6: Final answer
   x = 3,194.38