Finding the Fourth Proportional to 12,238.05, 18,359.80 and 3,918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.05 : 18,359.80 = 3,918.56 : x
2. Step 2: Convert to fraction form
   12,238.05/18,359.80 = 3,918.56/x
3. Step 3: Cross multiply
   12,238.05x = 18,359.80 × 3,918.56
4. Step 4: Simplify right side
   12,238.05x = 71,943,977.89
5. Step 5: Solve for x
   x = 71,943,977.89/12,238.05
6. Step 6: Final answer
   x = 5,878.71