Finding the Fourth Proportional to 12,173.18, 18,269.00 and 8,215.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,173.18 : 18,269.00 = 8,215.07 : x
2. Step 2: Convert to fraction form
   12,173.18/18,269.00 = 8,215.07/x
3. Step 3: Cross multiply
   12,173.18x = 18,269.00 × 8,215.07
4. Step 4: Simplify right side
   12,173.18x = 150,080,981.41
5. Step 5: Solve for x
   x = 150,080,981.41/12,173.18
6. Step 6: Final answer
   x = 12,328.83