Finding the Fourth Proportional to 13,667.31, 18,871.26 and 13,449.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,667.31 : 18,871.26 = 13,449.42 : x
2. Step 2: Convert to fraction form
   13,667.31/18,871.26 = 13,449.42/x
3. Step 3: Cross multiply
   13,667.31x = 18,871.26 × 13,449.42
4. Step 4: Simplify right side
   13,667.31x = 253,807,501.67
5. Step 5: Solve for x
   x = 253,807,501.67/13,667.31
6. Step 6: Final answer
   x = 18,570.41