Finding the Third Proportional to 190.31 and 211.78

Step by Step Solution

1. Step 1: Write the proportion equation
   190.31 : 211.78 = 211.78 : x
2. Step 2: Convert to fraction form
   190.31/211.78 = 211.78/x
3. Step 3: Cross multiply
   190.31x = 211.78 × 211.78
4. Step 4: Simplify right side
   190.31x = 44,851.30
5. Step 5: Solve for x
   x = 44,851.30/190.31
6. Step 6: Final answer
   x = 235.67