Finding the Fourth Proportional to 12,021.55, 18,038.78 and 5,006.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,021.55 : 18,038.78 = 5,006.41 : x
2. Step 2: Convert to fraction form
   12,021.55/18,038.78 = 5,006.41/x
3. Step 3: Cross multiply
   12,021.55x = 18,038.78 × 5,006.41
4. Step 4: Simplify right side
   12,021.55x = 90,309,413.35
5. Step 5: Solve for x
   x = 90,309,413.35/12,021.55
6. Step 6: Final answer
   x = 7,512.30