Finding the Fourth Proportional to 12,161.98, 18,238.51 and 5,920.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,161.98 : 18,238.51 = 5,920.12 : x
2. Step 2: Convert to fraction form
   12,161.98/18,238.51 = 5,920.12/x
3. Step 3: Cross multiply
   12,161.98x = 18,238.51 × 5,920.12
4. Step 4: Simplify right side
   12,161.98x = 107,974,167.82
5. Step 5: Solve for x
   x = 107,974,167.82/12,161.98
6. Step 6: Final answer
   x = 8,878.01