Finding the Third Proportional to 16,400 and 33,520

Step by Step Solution

1. Step 1: Write the proportion equation
   16,400 : 33,520 = 33,520 : x
2. Step 2: Convert to fraction form
   16,400/33,520 = 33,520/x
3. Step 3: Cross multiply
   16,400x = 33,520 × 33,520
4. Step 4: Simplify right side
   16,400x = 1,123,590,400
5. Step 5: Solve for x
   x = 1,123,590,400/16,400
6. Step 6: Final answer
   x = 68,511.61