Finding the Third Proportional to 4,890 and 10,405.50

Step by Step Solution

1. Step 1: Write the proportion equation
   4,890 : 10,405.50 = 10,405.50 : x
2. Step 2: Convert to fraction form
   4,890/10,405.50 = 10,405.50/x
3. Step 3: Cross multiply
   4,890x = 10,405.50 × 10,405.50
4. Step 4: Simplify right side
   4,890x = 108,274,430.25
5. Step 5: Solve for x
   x = 108,274,430.25/4,890
6. Step 6: Final answer
   x = 22,142.01