Finding the Fourth Proportional to 78.81, 108.63 and 72.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78.81 : 108.63 = 72.27 : x
2. Step 2: Convert to fraction form
   78.81/108.63 = 72.27/x
3. Step 3: Cross multiply
   78.81x = 108.63 × 72.27
4. Step 4: Simplify right side
   78.81x = 7,850.69
5. Step 5: Solve for x
   x = 7,850.69/78.81
6. Step 6: Final answer
   x = 99.62