Finding the Fourth Proportional to 13,131.09, 18,115.74 and 8,086.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.09 : 18,115.74 = 8,086.56 : x
2. Step 2: Convert to fraction form
   13,131.09/18,115.74 = 8,086.56/x
3. Step 3: Cross multiply
   13,131.09x = 18,115.74 × 8,086.56
4. Step 4: Simplify right side
   13,131.09x = 146,493,980.84
5. Step 5: Solve for x
   x = 146,493,980.84/13,131.09
6. Step 6: Final answer
   x = 11,156.27