Finding the Fourth Proportional to 72.69, 109.08 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 109.08 = 42.31 : x
2. Step 2: Convert to fraction form
   72.69/109.08 = 42.31/x
3. Step 3: Cross multiply
   72.69x = 109.08 × 42.31
4. Step 4: Simplify right side
   72.69x = 4,615.17
5. Step 5: Solve for x
   x = 4,615.17/72.69
6. Step 6: Final answer
   x = 63.49