Finding the Fourth Proportional to 72.81, 109.16 and 42.35

Step by Step Solution

1. Step 1: Write the proportion equation
   72.81 : 109.16 = 42.35 : x
2. Step 2: Convert to fraction form
   72.81/109.16 = 42.35/x
3. Step 3: Cross multiply
   72.81x = 109.16 × 42.35
4. Step 4: Simplify right side
   72.81x = 4,622.33
5. Step 5: Solve for x
   x = 4,622.33/72.81
6. Step 6: Final answer
   x = 63.48