Finding the Third Proportional to 10,704 and 19,920

Step by Step Solution

1. Step 1: Write the proportion equation
   10,704 : 19,920 = 19,920 : x
2. Step 2: Convert to fraction form
   10,704/19,920 = 19,920/x
3. Step 3: Cross multiply
   10,704x = 19,920 × 19,920
4. Step 4: Simplify right side
   10,704x = 396,806,400
5. Step 5: Solve for x
   x = 396,806,400/10,704
6. Step 6: Final answer
   x = 37,070.85