Finding the Fourth Proportional to 8,129.55, 12,170.56 and 7,351.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,129.55 : 12,170.56 = 7,351.34 : x
2. Step 2: Convert to fraction form
   8,129.55/12,170.56 = 7,351.34/x
3. Step 3: Cross multiply
   8,129.55x = 12,170.56 × 7,351.34
4. Step 4: Simplify right side
   8,129.55x = 89,469,924.55
5. Step 5: Solve for x
   x = 89,469,924.55/8,129.55
6. Step 6: Final answer
   x = 11,005.52