Finding the Third Proportional to 89.86 and 215.93

Step by Step Solution

1. Step 1: Write the proportion equation
   89.86 : 215.93 = 215.93 : x
2. Step 2: Convert to fraction form
   89.86/215.93 = 215.93/x
3. Step 3: Cross multiply
   89.86x = 215.93 × 215.93
4. Step 4: Simplify right side
   89.86x = 46,625.63
5. Step 5: Solve for x
   x = 46,625.63/89.86
6. Step 6: Final answer
   x = 518.87