Finding the Third Proportional to 311,134 and 643,004

Step by Step Solution

1. Step 1: Write the proportion equation
   311,134 : 643,004 = 643,004 : x
2. Step 2: Convert to fraction form
   311,134/643,004 = 643,004/x
3. Step 3: Cross multiply
   311,134x = 643,004 × 643,004
4. Step 4: Simplify right side
   311,134x = 413,454,144,016
5. Step 5: Solve for x
   x = 413,454,144,016/311,134
6. Step 6: Final answer
   x = 1,328,861.98