Finding the Fourth Proportional to 8,171.34, 12,240.96 and 5,389.53

Step by Step Solution

1. Step 1: Write the proportion equation
   8,171.34 : 12,240.96 = 5,389.53 : x
2. Step 2: Convert to fraction form
   8,171.34/12,240.96 = 5,389.53/x
3. Step 3: Cross multiply
   8,171.34x = 12,240.96 × 5,389.53
4. Step 4: Simplify right side
   8,171.34x = 65,973,021.15
5. Step 5: Solve for x
   x = 65,973,021.15/8,171.34
6. Step 6: Final answer
   x = 8,073.71