Finding the Third Proportional to 86 and 111

Step by Step Solution

1. Step 1: Write the proportion equation
   86 : 111 = 111 : x
2. Step 2: Convert to fraction form
   86/111 = 111/x
3. Step 3: Cross multiply
   86x = 111 × 111
4. Step 4: Simplify right side
   86x = 12,321
5. Step 5: Solve for x
   x = 12,321/86
6. Step 6: Final answer
   x = 143.27