Finding the Third Proportional to 311.06 and 340.31

Step by Step Solution

1. Step 1: Write the proportion equation
   311.06 : 340.31 = 340.31 : x
2. Step 2: Convert to fraction form
   311.06/340.31 = 340.31/x
3. Step 3: Cross multiply
   311.06x = 340.31 × 340.31
4. Step 4: Simplify right side
   311.06x = 115,812.60
5. Step 5: Solve for x
   x = 115,812.60/311.06
6. Step 6: Final answer
   x = 372.31