Finding the Fourth Proportional to 33,768.28, 50,654.56 and 12,991.76

Step by Step Solution

1. Step 1: Write the proportion equation
   33,768.28 : 50,654.56 = 12,991.76 : x
2. Step 2: Convert to fraction form
   33,768.28/50,654.56 = 12,991.76/x
3. Step 3: Cross multiply
   33,768.28x = 50,654.56 × 12,991.76
4. Step 4: Simplify right side
   33,768.28x = 658,091,886.43
5. Step 5: Solve for x
   x = 658,091,886.43/33,768.28
6. Step 6: Final answer
   x = 19,488.46