Finding the Fourth Proportional to 72.55, 108.37 and 52.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72.55 : 108.37 = 52.10 : x
2. Step 2: Convert to fraction form
   72.55/108.37 = 52.10/x
3. Step 3: Cross multiply
   72.55x = 108.37 × 52.10
4. Step 4: Simplify right side
   72.55x = 5,645.27
5. Step 5: Solve for x
   x = 5,645.27/72.55
6. Step 6: Final answer
   x = 77.82