Finding the Third Proportional to 399,504 and 858,300

Step by Step Solution

1. Step 1: Write the proportion equation
   399,504 : 858,300 = 858,300 : x
2. Step 2: Convert to fraction form
   399,504/858,300 = 858,300/x
3. Step 3: Cross multiply
   399,504x = 858,300 × 858,300
4. Step 4: Simplify right side
   399,504x = 736,678,890,000
5. Step 5: Solve for x
   x = 736,678,890,000/399,504
6. Step 6: Final answer
   x = 1,843,983.76