Finding the Fourth Proportional to 21,926.50, 30,258.57 and 11,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,926.50 : 30,258.57 = 11,990.50 : x
2. Step 2: Convert to fraction form
   21,926.50/30,258.57 = 11,990.50/x
3. Step 3: Cross multiply
   21,926.50x = 30,258.57 × 11,990.50
4. Step 4: Simplify right side
   21,926.50x = 362,815,383.59
5. Step 5: Solve for x
   x = 362,815,383.59/21,926.50
6. Step 6: Final answer
   x = 16,546.89