Finding the Third Proportional to 19,920 and 31,704

Step by Step Solution

1. Step 1: Write the proportion equation
   19,920 : 31,704 = 31,704 : x
2. Step 2: Convert to fraction form
   19,920/31,704 = 31,704/x
3. Step 3: Cross multiply
   19,920x = 31,704 × 31,704
4. Step 4: Simplify right side
   19,920x = 1,005,143,616
5. Step 5: Solve for x
   x = 1,005,143,616/19,920
6. Step 6: Final answer
   x = 50,459.02