Finding the Fourth Proportional to 72.43, 108.68 and 52.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72.43 : 108.68 = 52.18 : x
2. Step 2: Convert to fraction form
   72.43/108.68 = 52.18/x
3. Step 3: Cross multiply
   72.43x = 108.68 × 52.18
4. Step 4: Simplify right side
   72.43x = 5,670.39
5. Step 5: Solve for x
   x = 5,670.39/72.43
6. Step 6: Final answer
   x = 78.29