Finding the Fourth Proportional to 72.63, 108.82 and 50.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 108.82 = 50.91 : x
2. Step 2: Convert to fraction form
   72.63/108.82 = 50.91/x
3. Step 3: Cross multiply
   72.63x = 108.82 × 50.91
4. Step 4: Simplify right side
   72.63x = 5,540.03
5. Step 5: Solve for x
   x = 5,540.03/72.63
6. Step 6: Final answer
   x = 76.28