Finding the Fourth Proportional to 8,667.18, 12,993.86 and 8,178.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.18 : 12,993.86 = 8,178.18 : x
2. Step 2: Convert to fraction form
   8,667.18/12,993.86 = 8,178.18/x
3. Step 3: Cross multiply
   8,667.18x = 12,993.86 × 8,178.18
4. Step 4: Simplify right side
   8,667.18x = 106,266,140.69
5. Step 5: Solve for x
   x = 106,266,140.69/8,667.18
6. Step 6: Final answer
   x = 12,260.75