Finding the Fourth Proportional to 13,445.78, 18,563.48 and 8,667.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,445.78 : 18,563.48 = 8,667.42 : x
2. Step 2: Convert to fraction form
   13,445.78/18,563.48 = 8,667.42/x
3. Step 3: Cross multiply
   13,445.78x = 18,563.48 × 8,667.42
4. Step 4: Simplify right side
   13,445.78x = 160,897,501.79
5. Step 5: Solve for x
   x = 160,897,501.79/13,445.78
6. Step 6: Final answer
   x = 11,966.39