Finding the Fourth Proportional to 13,139, 18,131.82 and 8,954.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139 : 18,131.82 = 8,954.54 : x
2. Step 2: Convert to fraction form
   13,139/18,131.82 = 8,954.54/x
3. Step 3: Cross multiply
   13,139x = 18,131.82 × 8,954.54
4. Step 4: Simplify right side
   13,139x = 162,362,107.46
5. Step 5: Solve for x
   x = 162,362,107.46/13,139
6. Step 6: Final answer
   x = 12,357.27