Finding the Fourth Proportional to 67.81, 101.72 and 19.72

Step by Step Solution

1. Step 1: Write the proportion equation
   67.81 : 101.72 = 19.72 : x
2. Step 2: Convert to fraction form
   67.81/101.72 = 19.72/x
3. Step 3: Cross multiply
   67.81x = 101.72 × 19.72
4. Step 4: Simplify right side
   67.81x = 2,005.92
5. Step 5: Solve for x
   x = 2,005.92/67.81
6. Step 6: Final answer
   x = 29.58