Finding the Third Proportional to 7,122 and 10,890

Step by Step Solution

1. Step 1: Write the proportion equation
   7,122 : 10,890 = 10,890 : x
2. Step 2: Convert to fraction form
   7,122/10,890 = 10,890/x
3. Step 3: Cross multiply
   7,122x = 10,890 × 10,890
4. Step 4: Simplify right side
   7,122x = 118,592,100
5. Step 5: Solve for x
   x = 118,592,100/7,122
6. Step 6: Final answer
   x = 16,651.52