Finding the Third Proportional to 5,385 and 10,866

Step by Step Solution

1. Step 1: Write the proportion equation
   5,385 : 10,866 = 10,866 : x
2. Step 2: Convert to fraction form
   5,385/10,866 = 10,866/x
3. Step 3: Cross multiply
   5,385x = 10,866 × 10,866
4. Step 4: Simplify right side
   5,385x = 118,069,956
5. Step 5: Solve for x
   x = 118,069,956/5,385
6. Step 6: Final answer
   x = 21,925.71