Finding the Fourth Proportional to 78.95, 108.96 and 65.82

Step by Step Solution

1. Step 1: Write the proportion equation
   78.95 : 108.96 = 65.82 : x
2. Step 2: Convert to fraction form
   78.95/108.96 = 65.82/x
3. Step 3: Cross multiply
   78.95x = 108.96 × 65.82
4. Step 4: Simplify right side
   78.95x = 7,171.34
5. Step 5: Solve for x
   x = 7,171.34/78.95
6. Step 6: Final answer
   x = 90.84