Finding the Fourth Proportional to 93.22, 128.72 and 82.87

Step by Step Solution

1. Step 1: Write the proportion equation
   93.22 : 128.72 = 82.87 : x
2. Step 2: Convert to fraction form
   93.22/128.72 = 82.87/x
3. Step 3: Cross multiply
   93.22x = 128.72 × 82.87
4. Step 4: Simplify right side
   93.22x = 10,667.03
5. Step 5: Solve for x
   x = 10,667.03/93.22
6. Step 6: Final answer
   x = 114.43