Finding the Fourth Proportional to 89.78, 123.94 and 69.06

Step by Step Solution

1. Step 1: Write the proportion equation
   89.78 : 123.94 = 69.06 : x
2. Step 2: Convert to fraction form
   89.78/123.94 = 69.06/x
3. Step 3: Cross multiply
   89.78x = 123.94 × 69.06
4. Step 4: Simplify right side
   89.78x = 8,559.30
5. Step 5: Solve for x
   x = 8,559.30/89.78
6. Step 6: Final answer
   x = 95.34