Finding the Fourth Proportional to 12,238.29, 18,359.79 and 5,218.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.29 : 18,359.79 = 5,218.18 : x
2. Step 2: Convert to fraction form
   12,238.29/18,359.79 = 5,218.18/x
3. Step 3: Cross multiply
   12,238.29x = 18,359.79 × 5,218.18
4. Step 4: Simplify right side
   12,238.29x = 95,804,688.98
5. Step 5: Solve for x
   x = 95,804,688.98/12,238.29
6. Step 6: Final answer
   x = 7,828.27