Finding the Third Proportional to 18,118.69 and 39,915.28

Step by Step Solution

1. Step 1: Write the proportion equation
   18,118.69 : 39,915.28 = 39,915.28 : x
2. Step 2: Convert to fraction form
   18,118.69/39,915.28 = 39,915.28/x
3. Step 3: Cross multiply
   18,118.69x = 39,915.28 × 39,915.28
4. Step 4: Simplify right side
   18,118.69x = 1,593,229,677.27
5. Step 5: Solve for x
   x = 1,593,229,677.27/18,118.69
6. Step 6: Final answer
   x = 87,932.95