Finding the Fourth Proportional to 72.16, 108.18 and 50.43

Step by Step Solution

1. Step 1: Write the proportion equation
   72.16 : 108.18 = 50.43 : x
2. Step 2: Convert to fraction form
   72.16/108.18 = 50.43/x
3. Step 3: Cross multiply
   72.16x = 108.18 × 50.43
4. Step 4: Simplify right side
   72.16x = 5,454.92
5. Step 5: Solve for x
   x = 5,454.92/72.16
6. Step 6: Final answer
   x = 75.60