Finding the Fourth Proportional to 72.85, 109.72 and 67.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.85 : 109.72 = 67.72 : x
2. Step 2: Convert to fraction form
   72.85/109.72 = 67.72/x
3. Step 3: Cross multiply
   72.85x = 109.72 × 67.72
4. Step 4: Simplify right side
   72.85x = 7,430.24
5. Step 5: Solve for x
   x = 7,430.24/72.85
6. Step 6: Final answer
   x = 101.99