Finding the Fourth Proportional to 5,247.39, 7,241.91 and 3,918.79

Step by Step Solution

1. Step 1: Write the proportion equation
   5,247.39 : 7,241.91 = 3,918.79 : x
2. Step 2: Convert to fraction form
   5,247.39/7,241.91 = 3,918.79/x
3. Step 3: Cross multiply
   5,247.39x = 7,241.91 × 3,918.79
4. Step 4: Simplify right side
   5,247.39x = 28,379,468.69
5. Step 5: Solve for x
   x = 28,379,468.69/5,247.39
6. Step 6: Final answer
   x = 5,408.31