Finding the Third Proportional to 90.38 and 211.88

Step by Step Solution

1. Step 1: Write the proportion equation
   90.38 : 211.88 = 211.88 : x
2. Step 2: Convert to fraction form
   90.38/211.88 = 211.88/x
3. Step 3: Cross multiply
   90.38x = 211.88 × 211.88
4. Step 4: Simplify right side
   90.38x = 44,891.02
5. Step 5: Solve for x
   x = 44,891.02/90.38
6. Step 6: Final answer
   x = 496.72