Finding the Fourth Proportional to 12,215.50, 18,323.43 and 4,007.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.50 : 18,323.43 = 4,007.50 : x
2. Step 2: Convert to fraction form
   12,215.50/18,323.43 = 4,007.50/x
3. Step 3: Cross multiply
   12,215.50x = 18,323.43 × 4,007.50
4. Step 4: Simplify right side
   12,215.50x = 73,431,145.73
5. Step 5: Solve for x
   x = 73,431,145.73/12,215.50
6. Step 6: Final answer
   x = 6,011.31