Finding the Fourth Proportional to 6,418.57, 8,859.72 and 3,765.91

Step by Step Solution

1. Step 1: Write the proportion equation
   6,418.57 : 8,859.72 = 3,765.91 : x
2. Step 2: Convert to fraction form
   6,418.57/8,859.72 = 3,765.91/x
3. Step 3: Cross multiply
   6,418.57x = 8,859.72 × 3,765.91
4. Step 4: Simplify right side
   6,418.57x = 33,364,908.15
5. Step 5: Solve for x
   x = 33,364,908.15/6,418.57
6. Step 6: Final answer
   x = 5,198.18