Finding the Fourth Proportional to 67.19, 100.78 and 19.10

Step by Step Solution

1. Step 1: Write the proportion equation
   67.19 : 100.78 = 19.10 : x
2. Step 2: Convert to fraction form
   67.19/100.78 = 19.10/x
3. Step 3: Cross multiply
   67.19x = 100.78 × 19.10
4. Step 4: Simplify right side
   67.19x = 1,924.39
5. Step 5: Solve for x
   x = 1,924.39/67.19
6. Step 6: Final answer
   x = 28.64