Finding the Fourth Proportional to 12,141.62, 18,219.52 and 5,121.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,141.62 : 18,219.52 = 5,121.20 : x
2. Step 2: Convert to fraction form
   12,141.62/18,219.52 = 5,121.20/x
3. Step 3: Cross multiply
   12,141.62x = 18,219.52 × 5,121.20
4. Step 4: Simplify right side
   12,141.62x = 93,305,805.82
5. Step 5: Solve for x
   x = 93,305,805.82/12,141.62
6. Step 6: Final answer
   x = 7,684.79