Finding the Third Proportional to 21,720 and 45,072

Step by Step Solution

1. Step 1: Write the proportion equation
   21,720 : 45,072 = 45,072 : x
2. Step 2: Convert to fraction form
   21,720/45,072 = 45,072/x
3. Step 3: Cross multiply
   21,720x = 45,072 × 45,072
4. Step 4: Simplify right side
   21,720x = 2,031,485,184
5. Step 5: Solve for x
   x = 2,031,485,184/21,720
6. Step 6: Final answer
   x = 93,530.63