Finding the Fourth Proportional to 8,427.89, 12,624.92 and 4,198.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,427.89 : 12,624.92 = 4,198.40 : x
2. Step 2: Convert to fraction form
   8,427.89/12,624.92 = 4,198.40/x
3. Step 3: Cross multiply
   8,427.89x = 12,624.92 × 4,198.40
4. Step 4: Simplify right side
   8,427.89x = 53,004,443.10
5. Step 5: Solve for x
   x = 53,004,443.10/8,427.89
6. Step 6: Final answer
   x = 6,289.17