Finding the Fourth Proportional to 72.10, 108.17 and 53.07

Step by Step Solution

1. Step 1: Write the proportion equation
   72.10 : 108.17 = 53.07 : x
2. Step 2: Convert to fraction form
   72.10/108.17 = 53.07/x
3. Step 3: Cross multiply
   72.10x = 108.17 × 53.07
4. Step 4: Simplify right side
   72.10x = 5,740.83
5. Step 5: Solve for x
   x = 5,740.83/72.10
6. Step 6: Final answer
   x = 79.62