Finding the Third Proportional to 89.91 and 216.52

Step by Step Solution

1. Step 1: Write the proportion equation
   89.91 : 216.52 = 216.52 : x
2. Step 2: Convert to fraction form
   89.91/216.52 = 216.52/x
3. Step 3: Cross multiply
   89.91x = 216.52 × 216.52
4. Step 4: Simplify right side
   89.91x = 46,879.02
5. Step 5: Solve for x
   x = 46,879.02/89.91
6. Step 6: Final answer
   x = 521.42