Finding the Fourth Proportional to 108.72, 164.04 and 104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   108.72 : 164.04 = 104.50 : x
2. Step 2: Convert to fraction form
   108.72/164.04 = 104.50/x
3. Step 3: Cross multiply
   108.72x = 164.04 × 104.50
4. Step 4: Simplify right side
   108.72x = 17,142.16
5. Step 5: Solve for x
   x = 17,142.16/108.72
6. Step 6: Final answer
   x = 157.68