Finding the Third Proportional to 18.47 and 40.31

Step by Step Solution

1. Step 1: Write the proportion equation
   18.47 : 40.31 = 40.31 : x
2. Step 2: Convert to fraction form
   18.47/40.31 = 40.31/x
3. Step 3: Cross multiply
   18.47x = 40.31 × 40.31
4. Step 4: Simplify right side
   18.47x = 1,625.10
5. Step 5: Solve for x
   x = 1,625.10/18.47
6. Step 6: Final answer
   x = 87.99