Finding the Fourth Proportional to 5,168.16, 7,131.24 and 2,928.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,168.16 : 7,131.24 = 2,928.78 : x
2. Step 2: Convert to fraction form
   5,168.16/7,131.24 = 2,928.78/x
3. Step 3: Cross multiply
   5,168.16x = 7,131.24 × 2,928.78
4. Step 4: Simplify right side
   5,168.16x = 20,885,833.09
5. Step 5: Solve for x
   x = 20,885,833.09/5,168.16
6. Step 6: Final answer
   x = 4,041.25