Finding the Fourth Proportional to 21,895.50, 30,215.82 and 11,959.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,895.50 : 30,215.82 = 11,959.50 : x
2. Step 2: Convert to fraction form
   21,895.50/30,215.82 = 11,959.50/x
3. Step 3: Cross multiply
   21,895.50x = 30,215.82 × 11,959.50
4. Step 4: Simplify right side
   21,895.50x = 361,366,099.29
5. Step 5: Solve for x
   x = 361,366,099.29/21,895.50
6. Step 6: Final answer
   x = 16,504.13