Finding the Third Proportional to 40.17 and 85.78

Step by Step Solution

1. Step 1: Write the proportion equation
   40.17 : 85.78 = 85.78 : x
2. Step 2: Convert to fraction form
   40.17/85.78 = 85.78/x
3. Step 3: Cross multiply
   40.17x = 85.78 × 85.78
4. Step 4: Simplify right side
   40.17x = 7,358.42
5. Step 5: Solve for x
   x = 7,358.42/40.17
6. Step 6: Final answer
   x = 183.17