Finding the Third Proportional to 250,578 and 521,890

Step by Step Solution

1. Step 1: Write the proportion equation
   250,578 : 521,890 = 521,890 : x
2. Step 2: Convert to fraction form
   250,578/521,890 = 521,890/x
3. Step 3: Cross multiply
   250,578x = 521,890 × 521,890
4. Step 4: Simplify right side
   250,578x = 272,369,172,100
5. Step 5: Solve for x
   x = 272,369,172,100/250,578
6. Step 6: Final answer
   x = 1,086,963.63