Finding the Fourth Proportional to 5,218.05, 7,200.89 and 2,828.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,218.05 : 7,200.89 = 2,828.09 : x
2. Step 2: Convert to fraction form
   5,218.05/7,200.89 = 2,828.09/x
3. Step 3: Cross multiply
   5,218.05x = 7,200.89 × 2,828.09
4. Step 4: Simplify right side
   5,218.05x = 20,364,790.07
5. Step 5: Solve for x
   x = 20,364,790.07/5,218.05
6. Step 6: Final answer
   x = 3,902.76