Finding the Third Proportional to 311.09 and 436.03

Step by Step Solution

1. Step 1: Write the proportion equation
   311.09 : 436.03 = 436.03 : x
2. Step 2: Convert to fraction form
   311.09/436.03 = 436.03/x
3. Step 3: Cross multiply
   311.09x = 436.03 × 436.03
4. Step 4: Simplify right side
   311.09x = 190,123.25
5. Step 5: Solve for x
   x = 190,123.25/311.09
6. Step 6: Final answer
   x = 611.14