Finding the Fourth Proportional to 72.96, 100.67 and 51.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72.96 : 100.67 = 51.09 : x
2. Step 2: Convert to fraction form
   72.96/100.67 = 51.09/x
3. Step 3: Cross multiply
   72.96x = 100.67 × 51.09
4. Step 4: Simplify right side
   72.96x = 5,142.97
5. Step 5: Solve for x
   x = 5,142.97/72.96
6. Step 6: Final answer
   x = 70.49