Finding the Fourth Proportional to 72.82, 109.16 and 51.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.82 : 109.16 = 51.15 : x
2. Step 2: Convert to fraction form
   72.82/109.16 = 51.15/x
3. Step 3: Cross multiply
   72.82x = 109.16 × 51.15
4. Step 4: Simplify right side
   72.82x = 5,583.55
5. Step 5: Solve for x
   x = 5,583.55/72.82
6. Step 6: Final answer
   x = 76.68