Finding the Fourth Proportional to 72.69, 109.03 and 34.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 109.03 = 34.20 : x
2. Step 2: Convert to fraction form
   72.69/109.03 = 34.20/x
3. Step 3: Cross multiply
   72.69x = 109.03 × 34.20
4. Step 4: Simplify right side
   72.69x = 3,728.83
5. Step 5: Solve for x
   x = 3,728.83/72.69
6. Step 6: Final answer
   x = 51.30