Finding the Fourth Proportional to 12,072.43, 18,108.78 and 7,938.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,072.43 : 18,108.78 = 7,938.46 : x
2. Step 2: Convert to fraction form
   12,072.43/18,108.78 = 7,938.46/x
3. Step 3: Cross multiply
   12,072.43x = 18,108.78 × 7,938.46
4. Step 4: Simplify right side
   12,072.43x = 143,755,825.68
5. Step 5: Solve for x
   x = 143,755,825.68/12,072.43
6. Step 6: Final answer
   x = 11,907.78