Finding the Third Proportional to 10,108 and 21,890

Step by Step Solution

1. Step 1: Write the proportion equation
   10,108 : 21,890 = 21,890 : x
2. Step 2: Convert to fraction form
   10,108/21,890 = 21,890/x
3. Step 3: Cross multiply
   10,108x = 21,890 × 21,890
4. Step 4: Simplify right side
   10,108x = 479,172,100
5. Step 5: Solve for x
   x = 479,172,100/10,108
6. Step 6: Final answer
   x = 47,405.23