Finding the Fourth Proportional to 12,141.54, 18,216.69 and 4,245.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,141.54 : 18,216.69 = 4,245.21 : x
2. Step 2: Convert to fraction form
   12,141.54/18,216.69 = 4,245.21/x
3. Step 3: Cross multiply
   12,141.54x = 18,216.69 × 4,245.21
4. Step 4: Simplify right side
   12,141.54x = 77,333,674.55
5. Step 5: Solve for x
   x = 77,333,674.55/12,141.54
6. Step 6: Final answer
   x = 6,369.35