Finding the Fourth Proportional to 72.76, 109.06 and 42.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72.76 : 109.06 = 42.38 : x
2. Step 2: Convert to fraction form
   72.76/109.06 = 42.38/x
3. Step 3: Cross multiply
   72.76x = 109.06 × 42.38
4. Step 4: Simplify right side
   72.76x = 4,621.96
5. Step 5: Solve for x
   x = 4,621.96/72.76
6. Step 6: Final answer
   x = 63.52