Finding the Fourth Proportional to 78.82, 108.54 and 71.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78.82 : 108.54 = 71.94 : x
2. Step 2: Convert to fraction form
   78.82/108.54 = 71.94/x
3. Step 3: Cross multiply
   78.82x = 108.54 × 71.94
4. Step 4: Simplify right side
   78.82x = 7,808.16
5. Step 5: Solve for x
   x = 7,808.16/78.82
6. Step 6: Final answer
   x = 99.06