Finding the Fourth Proportional to 12,005.34, 18,021.27 and 7,078.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,005.34 : 18,021.27 = 7,078.54 : x
2. Step 2: Convert to fraction form
   12,005.34/18,021.27 = 7,078.54/x
3. Step 3: Cross multiply
   12,005.34x = 18,021.27 × 7,078.54
4. Step 4: Simplify right side
   12,005.34x = 127,564,280.55
5. Step 5: Solve for x
   x = 127,564,280.55/12,005.34
6. Step 6: Final answer
   x = 10,625.63