Finding the Fourth Proportional to 79,269.78, 118,904.43 and 20,105.31

Step by Step Solution

1. Step 1: Write the proportion equation
   79,269.78 : 118,904.43 = 20,105.31 : x
2. Step 2: Convert to fraction form
   79,269.78/118,904.43 = 20,105.31/x
3. Step 3: Cross multiply
   79,269.78x = 118,904.43 × 20,105.31
4. Step 4: Simplify right side
   79,269.78x = 2,390,610,425.52
5. Step 5: Solve for x
   x = 2,390,610,425.52/79,269.78
6. Step 6: Final answer
   x = 30,157.90