Finding the Third Proportional to 221,772 and 487,788

Step by Step Solution

1. Step 1: Write the proportion equation
   221,772 : 487,788 = 487,788 : x
2. Step 2: Convert to fraction form
   221,772/487,788 = 487,788/x
3. Step 3: Cross multiply
   221,772x = 487,788 × 487,788
4. Step 4: Simplify right side
   221,772x = 237,937,132,944
5. Step 5: Solve for x
   x = 237,937,132,944/221,772
6. Step 6: Final answer
   x = 1,072,890.77