Finding the Third Proportional to 21,148 and 30,210

Step by Step Solution

1. Step 1: Write the proportion equation
   21,148 : 30,210 = 30,210 : x
2. Step 2: Convert to fraction form
   21,148/30,210 = 30,210/x
3. Step 3: Cross multiply
   21,148x = 30,210 × 30,210
4. Step 4: Simplify right side
   21,148x = 912,644,100
5. Step 5: Solve for x
   x = 912,644,100/21,148
6. Step 6: Final answer
   x = 43,155.10