Finding the Fourth Proportional to 72.12, 107.33 and 71.37

Step by Step Solution

1. Step 1: Write the proportion equation
   72.12 : 107.33 = 71.37 : x
2. Step 2: Convert to fraction form
   72.12/107.33 = 71.37/x
3. Step 3: Cross multiply
   72.12x = 107.33 × 71.37
4. Step 4: Simplify right side
   72.12x = 7,659.61
5. Step 5: Solve for x
   x = 7,659.61/72.12
6. Step 6: Final answer
   x = 106.21