Finding the Fourth Proportional to 108.78, 150.06 and 69.96

Step by Step Solution

1. Step 1: Write the proportion equation
   108.78 : 150.06 = 69.96 : x
2. Step 2: Convert to fraction form
   108.78/150.06 = 69.96/x
3. Step 3: Cross multiply
   108.78x = 150.06 × 69.96
4. Step 4: Simplify right side
   108.78x = 10,498.20
5. Step 5: Solve for x
   x = 10,498.20/108.78
6. Step 6: Final answer
   x = 96.51