Finding the Fourth Proportional to 72.86, 109.27 and 34.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.86 : 109.27 = 34.31 : x
2. Step 2: Convert to fraction form
   72.86/109.27 = 34.31/x
3. Step 3: Cross multiply
   72.86x = 109.27 × 34.31
4. Step 4: Simplify right side
   72.86x = 3,748.61
5. Step 5: Solve for x
   x = 3,748.61/72.86
6. Step 6: Final answer
   x = 51.45