Finding the Fourth Proportional to 33,786.28, 50,671.72 and 12,728.50

Step by Step Solution

1. Step 1: Write the proportion equation
   33,786.28 : 50,671.72 = 12,728.50 : x
2. Step 2: Convert to fraction form
   33,786.28/50,671.72 = 12,728.50/x
3. Step 3: Cross multiply
   33,786.28x = 50,671.72 × 12,728.50
4. Step 4: Simplify right side
   33,786.28x = 644,974,988.02
5. Step 5: Solve for x
   x = 644,974,988.02/33,786.28
6. Step 6: Final answer
   x = 19,089.85