Finding the Fourth Proportional to 13,422.56, 18,540.56 and 10,216.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,422.56 : 18,540.56 = 10,216.38 : x
2. Step 2: Convert to fraction form
   13,422.56/18,540.56 = 10,216.38/x
3. Step 3: Cross multiply
   13,422.56x = 18,540.56 × 10,216.38
4. Step 4: Simplify right side
   13,422.56x = 189,417,406.37
5. Step 5: Solve for x
   x = 189,417,406.37/13,422.56
6. Step 6: Final answer
   x = 14,111.87