Finding the Third Proportional to 424,083.50 and 623,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   424,083.50 : 623,404.50 = 623,404.50 : x
2. Step 2: Convert to fraction form
   424,083.50/623,404.50 = 623,404.50/x
3. Step 3: Cross multiply
   424,083.50x = 623,404.50 × 623,404.50
4. Step 4: Simplify right side
   424,083.50x = 388,633,170,620.25
5. Step 5: Solve for x
   x = 388,633,170,620.25/424,083.50
6. Step 6: Final answer
   x = 916,407.19