Finding the Fourth Proportional to 5,128.56, 7,081.56 and 3,553.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.56 : 7,081.56 = 3,553.92 : x
2. Step 2: Convert to fraction form
   5,128.56/7,081.56 = 3,553.92/x
3. Step 3: Cross multiply
   5,128.56x = 7,081.56 × 3,553.92
4. Step 4: Simplify right side
   5,128.56x = 25,167,297.72
5. Step 5: Solve for x
   x = 25,167,297.72/5,128.56
6. Step 6: Final answer
   x = 4,907.28