Finding the Third Proportional to 99.19 and 205.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99.19 : 205.88 = 205.88 : x
2. Step 2: Convert to fraction form
   99.19/205.88 = 205.88/x
3. Step 3: Cross multiply
   99.19x = 205.88 × 205.88
4. Step 4: Simplify right side
   99.19x = 42,384.52
5. Step 5: Solve for x
   x = 42,384.52/99.19
6. Step 6: Final answer
   x = 427.32