Finding the Fourth Proportional to 33,978.56, 50,987.88 and 12,936.31

Step by Step Solution

1. Step 1: Write the proportion equation
   33,978.56 : 50,987.88 = 12,936.31 : x
2. Step 2: Convert to fraction form
   33,978.56/50,987.88 = 12,936.31/x
3. Step 3: Cross multiply
   33,978.56x = 50,987.88 × 12,936.31
4. Step 4: Simplify right side
   33,978.56x = 659,594,894.45
5. Step 5: Solve for x
   x = 659,594,894.45/33,978.56
6. Step 6: Final answer
   x = 19,412.09