Finding the Third Proportional to 21,109.50 and 42,543

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.50 : 42,543 = 42,543 : x
2. Step 2: Convert to fraction form
   21,109.50/42,543 = 42,543/x
3. Step 3: Cross multiply
   21,109.50x = 42,543 × 42,543
4. Step 4: Simplify right side
   21,109.50x = 1,809,906,849
5. Step 5: Solve for x
   x = 1,809,906,849/21,109.50
6. Step 6: Final answer
   x = 85,738.97