Finding the Fourth Proportional to 78.23, 107.94 and 50.55

Step by Step Solution

1. Step 1: Write the proportion equation
   78.23 : 107.94 = 50.55 : x
2. Step 2: Convert to fraction form
   78.23/107.94 = 50.55/x
3. Step 3: Cross multiply
   78.23x = 107.94 × 50.55
4. Step 4: Simplify right side
   78.23x = 5,456.37
5. Step 5: Solve for x
   x = 5,456.37/78.23
6. Step 6: Final answer
   x = 69.75