Finding the Fourth Proportional to 103.78, 154.72 and 100.60

Step by Step Solution

1. Step 1: Write the proportion equation
   103.78 : 154.72 = 100.60 : x
2. Step 2: Convert to fraction form
   103.78/154.72 = 100.60/x
3. Step 3: Cross multiply
   103.78x = 154.72 × 100.60
4. Step 4: Simplify right side
   103.78x = 15,564.83
5. Step 5: Solve for x
   x = 15,564.83/103.78
6. Step 6: Final answer
   x = 149.98