Finding the Fourth Proportional to 67.78, 101.67 and 19.69

Step by Step Solution

1. Step 1: Write the proportion equation
   67.78 : 101.67 = 19.69 : x
2. Step 2: Convert to fraction form
   67.78/101.67 = 19.69/x
3. Step 3: Cross multiply
   67.78x = 101.67 × 19.69
4. Step 4: Simplify right side
   67.78x = 2,001.67
5. Step 5: Solve for x
   x = 2,001.67/67.78
6. Step 6: Final answer
   x = 29.53