Finding the Fourth Proportional to 72.70, 108.96 and 65.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72.70 : 108.96 = 65.10 : x
2. Step 2: Convert to fraction form
   72.70/108.96 = 65.10/x
3. Step 3: Cross multiply
   72.70x = 108.96 × 65.10
4. Step 4: Simplify right side
   72.70x = 7,093.83
5. Step 5: Solve for x
   x = 7,093.83/72.70
6. Step 6: Final answer
   x = 97.58