Finding the Third Proportional to 90,072 and 208,521

Step by Step Solution

1. Step 1: Write the proportion equation
   90,072 : 208,521 = 208,521 : x
2. Step 2: Convert to fraction form
   90,072/208,521 = 208,521/x
3. Step 3: Cross multiply
   90,072x = 208,521 × 208,521
4. Step 4: Simplify right side
   90,072x = 43,481,007,441
5. Step 5: Solve for x
   x = 43,481,007,441/90,072
6. Step 6: Final answer
   x = 482,736.12