Finding the Third Proportional to 311,863.50 and 683,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,863.50 : 683,389.50 = 683,389.50 : x
2. Step 2: Convert to fraction form
   311,863.50/683,389.50 = 683,389.50/x
3. Step 3: Cross multiply
   311,863.50x = 683,389.50 × 683,389.50
4. Step 4: Simplify right side
   311,863.50x = 467,021,208,710.25
5. Step 5: Solve for x
   x = 467,021,208,710.25/311,863.50
6. Step 6: Final answer
   x = 1,497,518.01