Finding the Fourth Proportional to 82.89, 114.15 and 69.78

Step by Step Solution

1. Step 1: Write the proportion equation
   82.89 : 114.15 = 69.78 : x
2. Step 2: Convert to fraction form
   82.89/114.15 = 69.78/x
3. Step 3: Cross multiply
   82.89x = 114.15 × 69.78
4. Step 4: Simplify right side
   82.89x = 7,965.39
5. Step 5: Solve for x
   x = 7,965.39/82.89
6. Step 6: Final answer
   x = 96.10