Finding the Fourth Proportional to 72.12, 108.18 and 65.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72.12 : 108.18 = 65.10 : x
2. Step 2: Convert to fraction form
   72.12/108.18 = 65.10/x
3. Step 3: Cross multiply
   72.12x = 108.18 × 65.10
4. Step 4: Simplify right side
   72.12x = 7,042.52
5. Step 5: Solve for x
   x = 7,042.52/72.12
6. Step 6: Final answer
   x = 97.65