Finding the Fourth Proportional to 13,667.34, 20,507.49 and 8,131.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,667.34 : 20,507.49 = 8,131.62 : x
2. Step 2: Convert to fraction form
   13,667.34/20,507.49 = 8,131.62/x
3. Step 3: Cross multiply
   13,667.34x = 20,507.49 × 8,131.62
4. Step 4: Simplify right side
   13,667.34x = 166,759,115.83
5. Step 5: Solve for x
   x = 166,759,115.83/13,667.34
6. Step 6: Final answer
   x = 12,201.29