Finding the Third Proportional to 78.75 and 118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78.75 : 118.50 = 118.50 : x
2. Step 2: Convert to fraction form
   78.75/118.50 = 118.50/x
3. Step 3: Cross multiply
   78.75x = 118.50 × 118.50
4. Step 4: Simplify right side
   78.75x = 14,042.25
5. Step 5: Solve for x
   x = 14,042.25/78.75
6. Step 6: Final answer
   x = 178.31