Finding the Fourth Proportional to 109.20, 150.71 and 67.78

Step by Step Solution

1. Step 1: Write the proportion equation
   109.20 : 150.71 = 67.78 : x
2. Step 2: Convert to fraction form
   109.20/150.71 = 67.78/x
3. Step 3: Cross multiply
   109.20x = 150.71 × 67.78
4. Step 4: Simplify right side
   109.20x = 10,215.12
5. Step 5: Solve for x
   x = 10,215.12/109.20
6. Step 6: Final answer
   x = 93.55