Finding the Fourth Proportional to 12,216.15, 18,323.89 and 3,896.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216.15 : 18,323.89 = 3,896.66 : x
2. Step 2: Convert to fraction form
   12,216.15/18,323.89 = 3,896.66/x
3. Step 3: Cross multiply
   12,216.15x = 18,323.89 × 3,896.66
4. Step 4: Simplify right side
   12,216.15x = 71,402,005.28
5. Step 5: Solve for x
   x = 71,402,005.28/12,216.15
6. Step 6: Final answer
   x = 5,844.89