Finding the Fourth Proportional to 72.72, 109.08 and 51.08

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 109.08 = 51.08 : x
2. Step 2: Convert to fraction form
   72.72/109.08 = 51.08/x
3. Step 3: Cross multiply
   72.72x = 109.08 × 51.08
4. Step 4: Simplify right side
   72.72x = 5,571.81
5. Step 5: Solve for x
   x = 5,571.81/72.72
6. Step 6: Final answer
   x = 76.62