Finding the Fourth Proportional to 12,171.17, 18,266.00 and 8,213.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,171.17 : 18,266.00 = 8,213.05 : x
2. Step 2: Convert to fraction form
   12,171.17/18,266.00 = 8,213.05/x
3. Step 3: Cross multiply
   12,171.17x = 18,266.00 × 8,213.05
4. Step 4: Simplify right side
   12,171.17x = 150,019,553.07
5. Step 5: Solve for x
   x = 150,019,553.07/12,171.17
6. Step 6: Final answer
   x = 12,325.81