Finding the Third Proportional to 139.99 and 165.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139.99 : 165.59 = 165.59 : x
2. Step 2: Convert to fraction form
   139.99/165.59 = 165.59/x
3. Step 3: Cross multiply
   139.99x = 165.59 × 165.59
4. Step 4: Simplify right side
   139.99x = 27,418.70
5. Step 5: Solve for x
   x = 27,418.70/139.99
6. Step 6: Final answer
   x = 195.86