Finding the Fourth Proportional to 33,978.11, 50,946.98 and 12,919.69

Step by Step Solution

1. Step 1: Write the proportion equation
   33,978.11 : 50,946.98 = 12,919.69 : x
2. Step 2: Convert to fraction form
   33,978.11/50,946.98 = 12,919.69/x
3. Step 3: Cross multiply
   33,978.11x = 50,946.98 × 12,919.69
4. Step 4: Simplify right side
   33,978.11x = 658,219,123.44
5. Step 5: Solve for x
   x = 658,219,123.44/33,978.11
6. Step 6: Final answer
   x = 19,371.86