Finding the Third Proportional to 85.78 and 141.75

Step by Step Solution

1. Step 1: Write the proportion equation
   85.78 : 141.75 = 141.75 : x
2. Step 2: Convert to fraction form
   85.78/141.75 = 141.75/x
3. Step 3: Cross multiply
   85.78x = 141.75 × 141.75
4. Step 4: Simplify right side
   85.78x = 20,093.06
5. Step 5: Solve for x
   x = 20,093.06/85.78
6. Step 6: Final answer
   x = 234.24