Finding the Fourth Proportional to 67.78, 101.57 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   67.78 : 101.57 = 42.06 : x
2. Step 2: Convert to fraction form
   67.78/101.57 = 42.06/x
3. Step 3: Cross multiply
   67.78x = 101.57 × 42.06
4. Step 4: Simplify right side
   67.78x = 4,272.03
5. Step 5: Solve for x
   x = 4,272.03/67.78
6. Step 6: Final answer
   x = 63.03