Finding the Fourth Proportional to 12,380.50, 18,571.56 and 5,455

Step by Step Solution

1. Step 1: Write the proportion equation
   12,380.50 : 18,571.56 = 5,455 : x
2. Step 2: Convert to fraction form
   12,380.50/18,571.56 = 5,455/x
3. Step 3: Cross multiply
   12,380.50x = 18,571.56 × 5,455
4. Step 4: Simplify right side
   12,380.50x = 101,307,859.80
5. Step 5: Solve for x
   x = 101,307,859.80/12,380.50
6. Step 6: Final answer
   x = 8,182.86