Finding the Third Proportional to 258,140 and 555,834

Step by Step Solution

1. Step 1: Write the proportion equation
   258,140 : 555,834 = 555,834 : x
2. Step 2: Convert to fraction form
   258,140/555,834 = 555,834/x
3. Step 3: Cross multiply
   258,140x = 555,834 × 555,834
4. Step 4: Simplify right side
   258,140x = 308,951,435,556
5. Step 5: Solve for x
   x = 308,951,435,556/258,140
6. Step 6: Final answer
   x = 1,196,836.74