Finding the Third Proportional to 258,156 and 555,858

Step by Step Solution

1. Step 1: Write the proportion equation
   258,156 : 555,858 = 555,858 : x
2. Step 2: Convert to fraction form
   258,156/555,858 = 555,858/x
3. Step 3: Cross multiply
   258,156x = 555,858 × 555,858
4. Step 4: Simplify right side
   258,156x = 308,978,116,164
5. Step 5: Solve for x
   x = 308,978,116,164/258,156
6. Step 6: Final answer
   x = 1,196,865.91