Finding the Fourth Proportional to 5,222.82, 7,208.38 and 3,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   5,222.82 : 7,208.38 = 3,128.16 : x
2. Step 2: Convert to fraction form
   5,222.82/7,208.38 = 3,128.16/x
3. Step 3: Cross multiply
   5,222.82x = 7,208.38 × 3,128.16
4. Step 4: Simplify right side
   5,222.82x = 22,548,965.98
5. Step 5: Solve for x
   x = 22,548,965.98/5,222.82
6. Step 6: Final answer
   x = 4,317.39