Finding the Third Proportional to 15,400 and 33,390

Step by Step Solution

1. Step 1: Write the proportion equation
   15,400 : 33,390 = 33,390 : x
2. Step 2: Convert to fraction form
   15,400/33,390 = 33,390/x
3. Step 3: Cross multiply
   15,400x = 33,390 × 33,390
4. Step 4: Simplify right side
   15,400x = 1,114,892,100
5. Step 5: Solve for x
   x = 1,114,892,100/15,400
6. Step 6: Final answer
   x = 72,395.59