Finding the Fourth Proportional to 78.27, 116.83 and 72.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78.27 : 116.83 = 72.63 : x
2. Step 2: Convert to fraction form
   78.27/116.83 = 72.63/x
3. Step 3: Cross multiply
   78.27x = 116.83 × 72.63
4. Step 4: Simplify right side
   78.27x = 8,485.45
5. Step 5: Solve for x
   x = 8,485.45/78.27
6. Step 6: Final answer
   x = 108.42