Finding the Fourth Proportional to 12,215.08, 18,315.78 and 3,893.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.08 : 18,315.78 = 3,893.59 : x
2. Step 2: Convert to fraction form
   12,215.08/18,315.78 = 3,893.59/x
3. Step 3: Cross multiply
   12,215.08x = 18,315.78 × 3,893.59
4. Step 4: Simplify right side
   12,215.08x = 71,314,137.85
5. Step 5: Solve for x
   x = 71,314,137.85/12,215.08
6. Step 6: Final answer
   x = 5,838.20