Finding the Third Proportional to 17,160 and 18,780

Step by Step Solution

1. Step 1: Write the proportion equation
   17,160 : 18,780 = 18,780 : x
2. Step 2: Convert to fraction form
   17,160/18,780 = 18,780/x
3. Step 3: Cross multiply
   17,160x = 18,780 × 18,780
4. Step 4: Simplify right side
   17,160x = 352,688,400
5. Step 5: Solve for x
   x = 352,688,400/17,160
6. Step 6: Final answer
   x = 20,552.94