Finding the Fourth Proportional to 93.68, 128.96 and 82.72

Step by Step Solution

1. Step 1: Write the proportion equation
   93.68 : 128.96 = 82.72 : x
2. Step 2: Convert to fraction form
   93.68/128.96 = 82.72/x
3. Step 3: Cross multiply
   93.68x = 128.96 × 82.72
4. Step 4: Simplify right side
   93.68x = 10,667.57
5. Step 5: Solve for x
   x = 10,667.57/93.68
6. Step 6: Final answer
   x = 113.87