Finding the Fourth Proportional to 104.01, 155.76 and 69.78

Step by Step Solution

1. Step 1: Write the proportion equation
   104.01 : 155.76 = 69.78 : x
2. Step 2: Convert to fraction form
   104.01/155.76 = 69.78/x
3. Step 3: Cross multiply
   104.01x = 155.76 × 69.78
4. Step 4: Simplify right side
   104.01x = 10,868.93
5. Step 5: Solve for x
   x = 10,868.93/104.01
6. Step 6: Final answer
   x = 104.50