Finding the Third Proportional to 21,068 and 42,866

Step by Step Solution

1. Step 1: Write the proportion equation
   21,068 : 42,866 = 42,866 : x
2. Step 2: Convert to fraction form
   21,068/42,866 = 42,866/x
3. Step 3: Cross multiply
   21,068x = 42,866 × 42,866
4. Step 4: Simplify right side
   21,068x = 1,837,493,956
5. Step 5: Solve for x
   x = 1,837,493,956/21,068
6. Step 6: Final answer
   x = 87,217.29