Finding the Fourth Proportional to 72,723.69, 109,073.39 and 20,138.49

Step by Step Solution

1. Step 1: Write the proportion equation
   72,723.69 : 109,073.39 = 20,138.49 : x
2. Step 2: Convert to fraction form
   72,723.69/109,073.39 = 20,138.49/x
3. Step 3: Cross multiply
   72,723.69x = 109,073.39 × 20,138.49
4. Step 4: Simplify right side
   72,723.69x = 2,196,573,273.09
5. Step 5: Solve for x
   x = 2,196,573,273.09/72,723.69
6. Step 6: Final answer
   x = 30,204.37