Finding the Third Proportional to 99.07 and 215.55

Step by Step Solution

1. Step 1: Write the proportion equation
   99.07 : 215.55 = 215.55 : x
2. Step 2: Convert to fraction form
   99.07/215.55 = 215.55/x
3. Step 3: Cross multiply
   99.07x = 215.55 × 215.55
4. Step 4: Simplify right side
   99.07x = 46,463.82
5. Step 5: Solve for x
   x = 46,463.82/99.07
6. Step 6: Final answer
   x = 469.00