Finding the Fourth Proportional to 78.81, 118.10 and 50.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78.81 : 118.10 = 50.25 : x
2. Step 2: Convert to fraction form
   78.81/118.10 = 50.25/x
3. Step 3: Cross multiply
   78.81x = 118.10 × 50.25
4. Step 4: Simplify right side
   78.81x = 5,934.27
5. Step 5: Solve for x
   x = 5,934.27/78.81
6. Step 6: Final answer
   x = 75.30