Finding the Third Proportional to 315,399 and 424,957.50

Step by Step Solution

1. Step 1: Write the proportion equation
   315,399 : 424,957.50 = 424,957.50 : x
2. Step 2: Convert to fraction form
   315,399/424,957.50 = 424,957.50/x
3. Step 3: Cross multiply
   315,399x = 424,957.50 × 424,957.50
4. Step 4: Simplify right side
   315,399x = 180,588,876,806.25
5. Step 5: Solve for x
   x = 180,588,876,806.25/315,399
6. Step 6: Final answer
   x = 572,572.76