Finding the Fourth Proportional to 72.71, 109.08 and 42.22

Step by Step Solution

1. Step 1: Write the proportion equation
   72.71 : 109.08 = 42.22 : x
2. Step 2: Convert to fraction form
   72.71/109.08 = 42.22/x
3. Step 3: Cross multiply
   72.71x = 109.08 × 42.22
4. Step 4: Simplify right side
   72.71x = 4,605.36
5. Step 5: Solve for x
   x = 4,605.36/72.71
6. Step 6: Final answer
   x = 63.34