Finding the Fourth Proportional to 13,171.86, 18,189.29 and 8,464.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,171.86 : 18,189.29 = 8,464.34 : x
2. Step 2: Convert to fraction form
   13,171.86/18,189.29 = 8,464.34/x
3. Step 3: Cross multiply
   13,171.86x = 18,189.29 × 8,464.34
4. Step 4: Simplify right side
   13,171.86x = 153,960,401.55
5. Step 5: Solve for x
   x = 153,960,401.55/13,171.86
6. Step 6: Final answer
   x = 11,688.58