Finding the Third Proportional to 21,192 and 39,144

Step by Step Solution

1. Step 1: Write the proportion equation
   21,192 : 39,144 = 39,144 : x
2. Step 2: Convert to fraction form
   21,192/39,144 = 39,144/x
3. Step 3: Cross multiply
   21,192x = 39,144 × 39,144
4. Step 4: Simplify right side
   21,192x = 1,532,252,736
5. Step 5: Solve for x
   x = 1,532,252,736/21,192
6. Step 6: Final answer
   x = 72,303.36