Finding the Third Proportional to 90.88 and 215.94

Step by Step Solution

1. Step 1: Write the proportion equation
   90.88 : 215.94 = 215.94 : x
2. Step 2: Convert to fraction form
   90.88/215.94 = 215.94/x
3. Step 3: Cross multiply
   90.88x = 215.94 × 215.94
4. Step 4: Simplify right side
   90.88x = 46,629.00
5. Step 5: Solve for x
   x = 46,629.00/90.88
6. Step 6: Final answer
   x = 513.11