Finding the Third Proportional to 262,380 and 579,890

Step by Step Solution

1. Step 1: Write the proportion equation
   262,380 : 579,890 = 579,890 : x
2. Step 2: Convert to fraction form
   262,380/579,890 = 579,890/x
3. Step 3: Cross multiply
   262,380x = 579,890 × 579,890
4. Step 4: Simplify right side
   262,380x = 336,272,412,100
5. Step 5: Solve for x
   x = 336,272,412,100/262,380
6. Step 6: Final answer
   x = 1,281,623.65