Finding the Fourth Proportional to 72.42, 108.69 and 50.45

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 108.69 = 50.45 : x
2. Step 2: Convert to fraction form
   72.42/108.69 = 50.45/x
3. Step 3: Cross multiply
   72.42x = 108.69 × 50.45
4. Step 4: Simplify right side
   72.42x = 5,482.87
5. Step 5: Solve for x
   x = 5,482.87/72.42
6. Step 6: Final answer
   x = 75.71