Finding the Fourth Proportional to 83.94, 115.59 and 78.27

Step by Step Solution

1. Step 1: Write the proportion equation
   83.94 : 115.59 = 78.27 : x
2. Step 2: Convert to fraction form
   83.94/115.59 = 78.27/x
3. Step 3: Cross multiply
   83.94x = 115.59 × 78.27
4. Step 4: Simplify right side
   83.94x = 9,047.23
5. Step 5: Solve for x
   x = 9,047.23/83.94
6. Step 6: Final answer
   x = 107.78