Finding the Third Proportional to 5,280 and 10,551

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280 : 10,551 = 10,551 : x
2. Step 2: Convert to fraction form
   5,280/10,551 = 10,551/x
3. Step 3: Cross multiply
   5,280x = 10,551 × 10,551
4. Step 4: Simplify right side
   5,280x = 111,323,601
5. Step 5: Solve for x
   x = 111,323,601/5,280
6. Step 6: Final answer
   x = 21,084.02