Finding the Third Proportional to 221,696 and 487,680

Step by Step Solution

1. Step 1: Write the proportion equation
   221,696 : 487,680 = 487,680 : x
2. Step 2: Convert to fraction form
   221,696/487,680 = 487,680/x
3. Step 3: Cross multiply
   221,696x = 487,680 × 487,680
4. Step 4: Simplify right side
   221,696x = 237,831,782,400
5. Step 5: Solve for x
   x = 237,831,782,400/221,696
6. Step 6: Final answer
   x = 1,072,783.37