Finding the Fourth Proportional to 72.50, 108.68 and 65.81

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 108.68 = 65.81 : x
2. Step 2: Convert to fraction form
   72.50/108.68 = 65.81/x
3. Step 3: Cross multiply
   72.50x = 108.68 × 65.81
4. Step 4: Simplify right side
   72.50x = 7,152.17
5. Step 5: Solve for x
   x = 7,152.17/72.50
6. Step 6: Final answer
   x = 98.66