Finding the Third Proportional to 8,940 and 13,890

Step by Step Solution

1. Step 1: Write the proportion equation
   8,940 : 13,890 = 13,890 : x
2. Step 2: Convert to fraction form
   8,940/13,890 = 13,890/x
3. Step 3: Cross multiply
   8,940x = 13,890 × 13,890
4. Step 4: Simplify right side
   8,940x = 192,932,100
5. Step 5: Solve for x
   x = 192,932,100/8,940
6. Step 6: Final answer
   x = 21,580.77