Finding the Third Proportional to 21,072 and 42,750

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072 : 42,750 = 42,750 : x
2. Step 2: Convert to fraction form
   21,072/42,750 = 42,750/x
3. Step 3: Cross multiply
   21,072x = 42,750 × 42,750
4. Step 4: Simplify right side
   21,072x = 1,827,562,500
5. Step 5: Solve for x
   x = 1,827,562,500/21,072
6. Step 6: Final answer
   x = 86,729.43