Finding the Fourth Proportional to 8,213.88, 12,322.80 and 2,667.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,213.88 : 12,322.80 = 2,667.78 : x
2. Step 2: Convert to fraction form
   8,213.88/12,322.80 = 2,667.78/x
3. Step 3: Cross multiply
   8,213.88x = 12,322.80 × 2,667.78
4. Step 4: Simplify right side
   8,213.88x = 32,874,519.38
5. Step 5: Solve for x
   x = 32,874,519.38/8,213.88
6. Step 6: Final answer
   x = 4,002.31