Finding the Fourth Proportional to 72.38, 108.55 and 52.03

Step by Step Solution

1. Step 1: Write the proportion equation
   72.38 : 108.55 = 52.03 : x
2. Step 2: Convert to fraction form
   72.38/108.55 = 52.03/x
3. Step 3: Cross multiply
   72.38x = 108.55 × 52.03
4. Step 4: Simplify right side
   72.38x = 5,647.86
5. Step 5: Solve for x
   x = 5,647.86/72.38
6. Step 6: Final answer
   x = 78.03