Finding the Fourth Proportional to 8,658.05, 12,985.37 and 4,272.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,658.05 : 12,985.37 = 4,272.71 : x
2. Step 2: Convert to fraction form
   8,658.05/12,985.37 = 4,272.71/x
3. Step 3: Cross multiply
   8,658.05x = 12,985.37 × 4,272.71
4. Step 4: Simplify right side
   8,658.05x = 55,482,698.89
5. Step 5: Solve for x
   x = 55,482,698.89/8,658.05
6. Step 6: Final answer
   x = 6,408.22