Finding the Fourth Proportional to 12,218, 18,295.98 and 10,238.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,218 : 18,295.98 = 10,238.42 : x
2. Step 2: Convert to fraction form
   12,218/18,295.98 = 10,238.42/x
3. Step 3: Cross multiply
   12,218x = 18,295.98 × 10,238.42
4. Step 4: Simplify right side
   12,218x = 187,321,927.55
5. Step 5: Solve for x
   x = 187,321,927.55/12,218
6. Step 6: Final answer
   x = 15,331.64