Finding the Third Proportional to 39.94 and 86.63

Step by Step Solution

1. Step 1: Write the proportion equation
   39.94 : 86.63 = 86.63 : x
2. Step 2: Convert to fraction form
   39.94/86.63 = 86.63/x
3. Step 3: Cross multiply
   39.94x = 86.63 × 86.63
4. Step 4: Simplify right side
   39.94x = 7,503.89
5. Step 5: Solve for x
   x = 7,503.89/39.94
6. Step 6: Final answer
   x = 187.89