Finding the Third Proportional to 424,745 and 643,293.50

Step by Step Solution

1. Step 1: Write the proportion equation
   424,745 : 643,293.50 = 643,293.50 : x
2. Step 2: Convert to fraction form
   424,745/643,293.50 = 643,293.50/x
3. Step 3: Cross multiply
   424,745x = 643,293.50 × 643,293.50
4. Step 4: Simplify right side
   424,745x = 413,826,527,142.25
5. Step 5: Solve for x
   x = 413,826,527,142.25/424,745
6. Step 6: Final answer
   x = 974,294.05