Finding the Third Proportional to 4,978 and 10,890

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978 : 10,890 = 10,890 : x
2. Step 2: Convert to fraction form
   4,978/10,890 = 10,890/x
3. Step 3: Cross multiply
   4,978x = 10,890 × 10,890
4. Step 4: Simplify right side
   4,978x = 118,592,100
5. Step 5: Solve for x
   x = 118,592,100/4,978
6. Step 6: Final answer
   x = 23,823.24