Finding the Fourth Proportional to 79,020.78, 109,015.83 and 51,789.42

Step by Step Solution

1. Step 1: Write the proportion equation
   79,020.78 : 109,015.83 = 51,789.42 : x
2. Step 2: Convert to fraction form
   79,020.78/109,015.83 = 51,789.42/x
3. Step 3: Cross multiply
   79,020.78x = 109,015.83 × 51,789.42
4. Step 4: Simplify right side
   79,020.78x = 5,645,866,606.52
5. Step 5: Solve for x
   x = 5,645,866,606.52/79,020.78
6. Step 6: Final answer
   x = 71,447.87