Finding the Fourth Proportional to 112.73, 168.91 and 72.06

Step by Step Solution

1. Step 1: Write the proportion equation
   112.73 : 168.91 = 72.06 : x
2. Step 2: Convert to fraction form
   112.73/168.91 = 72.06/x
3. Step 3: Cross multiply
   112.73x = 168.91 × 72.06
4. Step 4: Simplify right side
   112.73x = 12,171.47
5. Step 5: Solve for x
   x = 12,171.47/112.73
6. Step 6: Final answer
   x = 107.97