Finding the Fourth Proportional to 72.84, 109.35 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 109.35 = 42.42 : x
2. Step 2: Convert to fraction form
   72.84/109.35 = 42.42/x
3. Step 3: Cross multiply
   72.84x = 109.35 × 42.42
4. Step 4: Simplify right side
   72.84x = 4,638.63
5. Step 5: Solve for x
   x = 4,638.63/72.84
6. Step 6: Final answer
   x = 63.68