Finding the Third Proportional to 13,320 and 19,980

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320 : 19,980 = 19,980 : x
2. Step 2: Convert to fraction form
   13,320/19,980 = 19,980/x
3. Step 3: Cross multiply
   13,320x = 19,980 × 19,980
4. Step 4: Simplify right side
   13,320x = 399,200,400
5. Step 5: Solve for x
   x = 399,200,400/13,320
6. Step 6: Final answer
   x = 29,970