Finding the Fourth Proportional to 8,667.34, 12,999.30 and 3,986.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.34 : 12,999.30 = 3,986.08 : x
2. Step 2: Convert to fraction form
   8,667.34/12,999.30 = 3,986.08/x
3. Step 3: Cross multiply
   8,667.34x = 12,999.30 × 3,986.08
4. Step 4: Simplify right side
   8,667.34x = 51,816,249.74
5. Step 5: Solve for x
   x = 51,816,249.74/8,667.34
6. Step 6: Final answer
   x = 5,978.33