Finding the Fourth Proportional to 72.84, 109.08 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 109.08 = 42.31 : x
2. Step 2: Convert to fraction form
   72.84/109.08 = 42.31/x
3. Step 3: Cross multiply
   72.84x = 109.08 × 42.31
4. Step 4: Simplify right side
   72.84x = 4,614.42
5. Step 5: Solve for x
   x = 4,614.42/72.84
6. Step 6: Final answer
   x = 63.35