Finding the Fourth Proportional to 7,728.39, 10,667.79 and 5,208.87

Step by Step Solution

1. Step 1: Write the proportion equation
   7,728.39 : 10,667.79 = 5,208.87 : x
2. Step 2: Convert to fraction form
   7,728.39/10,667.79 = 5,208.87/x
3. Step 3: Cross multiply
   7,728.39x = 10,667.79 × 5,208.87
4. Step 4: Simplify right side
   7,728.39x = 55,567,131.30
5. Step 5: Solve for x
   x = 55,567,131.30/7,728.39
6. Step 6: Final answer
   x = 7,190.00