Finding the Third Proportional to 16,398 and 35,910

Step by Step Solution

1. Step 1: Write the proportion equation
   16,398 : 35,910 = 35,910 : x
2. Step 2: Convert to fraction form
   16,398/35,910 = 35,910/x
3. Step 3: Cross multiply
   16,398x = 35,910 × 35,910
4. Step 4: Simplify right side
   16,398x = 1,289,528,100
5. Step 5: Solve for x
   x = 1,289,528,100/16,398
6. Step 6: Final answer
   x = 78,639.35