Finding the Fourth Proportional to 72.18, 107.59 and 67.62

Step by Step Solution

1. Step 1: Write the proportion equation
   72.18 : 107.59 = 67.62 : x
2. Step 2: Convert to fraction form
   72.18/107.59 = 67.62/x
3. Step 3: Cross multiply
   72.18x = 107.59 × 67.62
4. Step 4: Simplify right side
   72.18x = 7,275.24
5. Step 5: Solve for x
   x = 7,275.24/72.18
6. Step 6: Final answer
   x = 100.79