Finding the Fourth Proportional to 21,796.29, 30,078.45 and 12,236.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,796.29 : 30,078.45 = 12,236.40 : x
2. Step 2: Convert to fraction form
   21,796.29/30,078.45 = 12,236.40/x
3. Step 3: Cross multiply
   21,796.29x = 30,078.45 × 12,236.40
4. Step 4: Simplify right side
   21,796.29x = 368,051,945.58
5. Step 5: Solve for x
   x = 368,051,945.58/21,796.29
6. Step 6: Final answer
   x = 16,885.99