Finding the Fourth Proportional to 104.72, 156.83 and 89.12

Step by Step Solution

1. Step 1: Write the proportion equation
   104.72 : 156.83 = 89.12 : x
2. Step 2: Convert to fraction form
   104.72/156.83 = 89.12/x
3. Step 3: Cross multiply
   104.72x = 156.83 × 89.12
4. Step 4: Simplify right side
   104.72x = 13,976.69
5. Step 5: Solve for x
   x = 13,976.69/104.72
6. Step 6: Final answer
   x = 133.47