Finding the Fourth Proportional to 79,768.92, 119,687.94 and 42,789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   79,768.92 : 119,687.94 = 42,789.72 : x
2. Step 2: Convert to fraction form
   79,768.92/119,687.94 = 42,789.72/x
3. Step 3: Cross multiply
   79,768.92x = 119,687.94 × 42,789.72
4. Step 4: Simplify right side
   79,768.92x = 5,121,413,439.98
5. Step 5: Solve for x
   x = 5,121,413,439.98/79,768.92
6. Step 6: Final answer
   x = 64,203.12