Finding the Fourth Proportional to 83.72, 115.38 and 67.34

Step by Step Solution

1. Step 1: Write the proportion equation
   83.72 : 115.38 = 67.34 : x
2. Step 2: Convert to fraction form
   83.72/115.38 = 67.34/x
3. Step 3: Cross multiply
   83.72x = 115.38 × 67.34
4. Step 4: Simplify right side
   83.72x = 7,769.69
5. Step 5: Solve for x
   x = 7,769.69/83.72
6. Step 6: Final answer
   x = 92.81