Finding the Fourth Proportional to 67.86, 101.83 and 42.21

Step by Step Solution

1. Step 1: Write the proportion equation
   67.86 : 101.83 = 42.21 : x
2. Step 2: Convert to fraction form
   67.86/101.83 = 42.21/x
3. Step 3: Cross multiply
   67.86x = 101.83 × 42.21
4. Step 4: Simplify right side
   67.86x = 4,298.73
5. Step 5: Solve for x
   x = 4,298.73/67.86
6. Step 6: Final answer
   x = 63.35