Finding the Fourth Proportional to 72.86, 109.29 and 42.39

Step by Step Solution

1. Step 1: Write the proportion equation
   72.86 : 109.29 = 42.39 : x
2. Step 2: Convert to fraction form
   72.86/109.29 = 42.39/x
3. Step 3: Cross multiply
   72.86x = 109.29 × 42.39
4. Step 4: Simplify right side
   72.86x = 4,632.80
5. Step 5: Solve for x
   x = 4,632.80/72.86
6. Step 6: Final answer
   x = 63.59