Finding the Fourth Proportional to 67.19, 100.56 and 42.84

Step by Step Solution

1. Step 1: Write the proportion equation
   67.19 : 100.56 = 42.84 : x
2. Step 2: Convert to fraction form
   67.19/100.56 = 42.84/x
3. Step 3: Cross multiply
   67.19x = 100.56 × 42.84
4. Step 4: Simplify right side
   67.19x = 4,307.99
5. Step 5: Solve for x
   x = 4,307.99/67.19
6. Step 6: Final answer
   x = 64.12