Finding the Third Proportional to 78.89 and 170.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78.89 : 170.25 = 170.25 : x
2. Step 2: Convert to fraction form
   78.89/170.25 = 170.25/x
3. Step 3: Cross multiply
   78.89x = 170.25 × 170.25
4. Step 4: Simplify right side
   78.89x = 28,986.06
5. Step 5: Solve for x
   x = 28,986.06/78.89
6. Step 6: Final answer
   x = 367.42