Finding the Fourth Proportional to 72.10, 108.09 and 65.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.10 : 108.09 = 65.98 : x
2. Step 2: Convert to fraction form
   72.10/108.09 = 65.98/x
3. Step 3: Cross multiply
   72.10x = 108.09 × 65.98
4. Step 4: Simplify right side
   72.10x = 7,131.78
5. Step 5: Solve for x
   x = 7,131.78/72.10
6. Step 6: Final answer
   x = 98.92