Finding the Third Proportional to 221,690 and 476,640

Step by Step Solution

1. Step 1: Write the proportion equation
   221,690 : 476,640 = 476,640 : x
2. Step 2: Convert to fraction form
   221,690/476,640 = 476,640/x
3. Step 3: Cross multiply
   221,690x = 476,640 × 476,640
4. Step 4: Simplify right side
   221,690x = 227,185,689,600
5. Step 5: Solve for x
   x = 227,185,689,600/221,690
6. Step 6: Final answer
   x = 1,024,789.98