Finding the Fourth Proportional to 39,067.20, 53,908.88 and 21,836.34

Step by Step Solution

1. Step 1: Write the proportion equation
   39,067.20 : 53,908.88 = 21,836.34 : x
2. Step 2: Convert to fraction form
   39,067.20/53,908.88 = 21,836.34/x
3. Step 3: Cross multiply
   39,067.20x = 53,908.88 × 21,836.34
4. Step 4: Simplify right side
   39,067.20x = 1,177,172,523.52
5. Step 5: Solve for x
   x = 1,177,172,523.52/39,067.20
6. Step 6: Final answer
   x = 30,131.99