Finding the Fourth Proportional to 83.67, 115.20 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   83.67 : 115.20 = 72.69 : x
2. Step 2: Convert to fraction form
   83.67/115.20 = 72.69/x
3. Step 3: Cross multiply
   83.67x = 115.20 × 72.69
4. Step 4: Simplify right side
   83.67x = 8,373.89
5. Step 5: Solve for x
   x = 8,373.89/83.67
6. Step 6: Final answer
   x = 100.08