Finding the Fourth Proportional to 13,144.68, 18,139.41 and 8,106.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.68 : 18,139.41 = 8,106.89 : x
2. Step 2: Convert to fraction form
   13,144.68/18,139.41 = 8,106.89/x
3. Step 3: Cross multiply
   13,144.68x = 18,139.41 × 8,106.89
4. Step 4: Simplify right side
   13,144.68x = 147,054,110.84
5. Step 5: Solve for x
   x = 147,054,110.84/13,144.68
6. Step 6: Final answer
   x = 11,187.35