Finding the Fourth Proportional to 33,912.13, 50,878.78 and 20,418.10

Step by Step Solution

1. Step 1: Write the proportion equation
   33,912.13 : 50,878.78 = 20,418.10 : x
2. Step 2: Convert to fraction form
   33,912.13/50,878.78 = 20,418.10/x
3. Step 3: Cross multiply
   33,912.13x = 50,878.78 × 20,418.10
4. Step 4: Simplify right side
   33,912.13x = 1,038,847,763.52
5. Step 5: Solve for x
   x = 1,038,847,763.52/33,912.13
6. Step 6: Final answer
   x = 30,633.52