Finding the Fourth Proportional to 6,218.43, 8,578.82 and 4,118.91

Step by Step Solution

1. Step 1: Write the proportion equation
   6,218.43 : 8,578.82 = 4,118.91 : x
2. Step 2: Convert to fraction form
   6,218.43/8,578.82 = 4,118.91/x
3. Step 3: Cross multiply
   6,218.43x = 8,578.82 × 4,118.91
4. Step 4: Simplify right side
   6,218.43x = 35,335,366.89
5. Step 5: Solve for x
   x = 35,335,366.89/6,218.43
6. Step 6: Final answer
   x = 5,682.36