Finding the Fourth Proportional to 104.89, 144.74 and 72.08

Step by Step Solution

1. Step 1: Write the proportion equation
   104.89 : 144.74 = 72.08 : x
2. Step 2: Convert to fraction form
   104.89/144.74 = 72.08/x
3. Step 3: Cross multiply
   104.89x = 144.74 × 72.08
4. Step 4: Simplify right side
   104.89x = 10,432.50
5. Step 5: Solve for x
   x = 10,432.50/104.89
6. Step 6: Final answer
   x = 99.47