Finding the Fourth Proportional to 72.76, 109.12 and 30

Step by Step Solution

1. Step 1: Write the proportion equation
   72.76 : 109.12 = 30 : x
2. Step 2: Convert to fraction form
   72.76/109.12 = 30/x
3. Step 3: Cross multiply
   72.76x = 109.12 × 30
4. Step 4: Simplify right side
   72.76x = 3,273.60
5. Step 5: Solve for x
   x = 3,273.60/72.76
6. Step 6: Final answer
   x = 44.99