Finding the Fourth Proportional to 8,165.34, 12,231.48 and 5,385.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,165.34 : 12,231.48 = 5,385.12 : x
2. Step 2: Convert to fraction form
   8,165.34/12,231.48 = 5,385.12/x
3. Step 3: Cross multiply
   8,165.34x = 12,231.48 × 5,385.12
4. Step 4: Simplify right side
   8,165.34x = 65,867,987.58
5. Step 5: Solve for x
   x = 65,867,987.58/8,165.34
6. Step 6: Final answer
   x = 8,066.78