Finding the Fourth Proportional to 8,667.34, 12,992.37 and 4,278.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.34 : 12,992.37 = 4,278.22 : x
2. Step 2: Convert to fraction form
   8,667.34/12,992.37 = 4,278.22/x
3. Step 3: Cross multiply
   8,667.34x = 12,992.37 × 4,278.22
4. Step 4: Simplify right side
   8,667.34x = 55,584,217.18
5. Step 5: Solve for x
   x = 55,584,217.18/8,667.34
6. Step 6: Final answer
   x = 6,413.07