Finding the Fourth Proportional to 104.78, 144.56 and 73.72

Step by Step Solution

1. Step 1: Write the proportion equation
   104.78 : 144.56 = 73.72 : x
2. Step 2: Convert to fraction form
   104.78/144.56 = 73.72/x
3. Step 3: Cross multiply
   104.78x = 144.56 × 73.72
4. Step 4: Simplify right side
   104.78x = 10,656.96
5. Step 5: Solve for x
   x = 10,656.96/104.78
6. Step 6: Final answer
   x = 101.71