Finding the Fourth Proportional to 6,408.05, 9,615.72 and 5,117.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,408.05 : 9,615.72 = 5,117.72 : x
2. Step 2: Convert to fraction form
   6,408.05/9,615.72 = 5,117.72/x
3. Step 3: Cross multiply
   6,408.05x = 9,615.72 × 5,117.72
4. Step 4: Simplify right side
   6,408.05x = 49,210,514.48
5. Step 5: Solve for x
   x = 49,210,514.48/6,408.05
6. Step 6: Final answer
   x = 7,679.49