Finding the Fourth Proportional to 67.83, 101.78 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   67.83 : 101.78 = 42.18 : x
2. Step 2: Convert to fraction form
   67.83/101.78 = 42.18/x
3. Step 3: Cross multiply
   67.83x = 101.78 × 42.18
4. Step 4: Simplify right side
   67.83x = 4,292.87
5. Step 5: Solve for x
   x = 4,292.87/67.83
6. Step 6: Final answer
   x = 63.29