Finding the Fourth Proportional to 13,415.50, 18,514.20 and 8,111.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,415.50 : 18,514.20 = 8,111.62 : x
2. Step 2: Convert to fraction form
   13,415.50/18,514.20 = 8,111.62/x
3. Step 3: Cross multiply
   13,415.50x = 18,514.20 × 8,111.62
4. Step 4: Simplify right side
   13,415.50x = 150,180,155.00
5. Step 5: Solve for x
   x = 150,180,155.00/13,415.50
6. Step 6: Final answer
   x = 11,194.53