Finding the Third Proportional to 99.19 and 215.06

Step by Step Solution

1. Step 1: Write the proportion equation
   99.19 : 215.06 = 215.06 : x
2. Step 2: Convert to fraction form
   99.19/215.06 = 215.06/x
3. Step 3: Cross multiply
   99.19x = 215.06 × 215.06
4. Step 4: Simplify right side
   99.19x = 46,251.88
5. Step 5: Solve for x
   x = 46,251.88/99.19
6. Step 6: Final answer
   x = 466.31