Finding the Fourth Proportional to 13,499.43, 18,621.41 and 8,118.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,499.43 : 18,621.41 = 8,118.12 : x
2. Step 2: Convert to fraction form
   13,499.43/18,621.41 = 8,118.12/x
3. Step 3: Cross multiply
   13,499.43x = 18,621.41 × 8,118.12
4. Step 4: Simplify right side
   13,499.43x = 151,170,840.95
5. Step 5: Solve for x
   x = 151,170,840.95/13,499.43
6. Step 6: Final answer
   x = 11,198.31