Finding the Fourth Proportional to 72.86, 109.08 and 42.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72.86 : 109.08 = 42.38 : x
2. Step 2: Convert to fraction form
   72.86/109.08 = 42.38/x
3. Step 3: Cross multiply
   72.86x = 109.08 × 42.38
4. Step 4: Simplify right side
   72.86x = 4,622.81
5. Step 5: Solve for x
   x = 4,622.81/72.86
6. Step 6: Final answer
   x = 63.45