Finding the Fourth Proportional to 72.36, 108.59 and 65.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.36 : 108.59 = 65.98 : x
2. Step 2: Convert to fraction form
   72.36/108.59 = 65.98/x
3. Step 3: Cross multiply
   72.36x = 108.59 × 65.98
4. Step 4: Simplify right side
   72.36x = 7,164.17
5. Step 5: Solve for x
   x = 7,164.17/72.36
6. Step 6: Final answer
   x = 99.01