Finding the Third Proportional to 99.25 and 215.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99.25 : 215.56 = 215.56 : x
2. Step 2: Convert to fraction form
   99.25/215.56 = 215.56/x
3. Step 3: Cross multiply
   99.25x = 215.56 × 215.56
4. Step 4: Simplify right side
   99.25x = 46,467.19
5. Step 5: Solve for x
   x = 46,467.19/99.25
6. Step 6: Final answer
   x = 468.18