Finding the Third Proportional to 639,360 and 993,384

Step by Step Solution

1. Step 1: Write the proportion equation
   639,360 : 993,384 = 993,384 : x
2. Step 2: Convert to fraction form
   639,360/993,384 = 993,384/x
3. Step 3: Cross multiply
   639,360x = 993,384 × 993,384
4. Step 4: Simplify right side
   639,360x = 986,811,771,456
5. Step 5: Solve for x
   x = 986,811,771,456/639,360
6. Step 6: Final answer
   x = 1,543,436.83