Finding the Third Proportional to 99.38 and 210.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99.38 : 210.38 = 210.38 : x
2. Step 2: Convert to fraction form
   99.38/210.38 = 210.38/x
3. Step 3: Cross multiply
   99.38x = 210.38 × 210.38
4. Step 4: Simplify right side
   99.38x = 44,257.64
5. Step 5: Solve for x
   x = 44,257.64/99.38
6. Step 6: Final answer
   x = 445.36