Finding the Fourth Proportional to 72.34, 107.63 and 72.16

Step by Step Solution

1. Step 1: Write the proportion equation
   72.34 : 107.63 = 72.16 : x
2. Step 2: Convert to fraction form
   72.34/107.63 = 72.16/x
3. Step 3: Cross multiply
   72.34x = 107.63 × 72.16
4. Step 4: Simplify right side
   72.34x = 7,766.58
5. Step 5: Solve for x
   x = 7,766.58/72.34
6. Step 6: Final answer
   x = 107.36