Finding the Fourth Proportional to 72.73, 109.12 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.73 : 109.12 = 42.31 : x
2. Step 2: Convert to fraction form
   72.73/109.12 = 42.31/x
3. Step 3: Cross multiply
   72.73x = 109.12 × 42.31
4. Step 4: Simplify right side
   72.73x = 4,616.87
5. Step 5: Solve for x
   x = 4,616.87/72.73
6. Step 6: Final answer
   x = 63.48