Finding the Third Proportional to 393,985 and 602,413.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,985 : 602,413.50 = 602,413.50 : x
2. Step 2: Convert to fraction form
   393,985/602,413.50 = 602,413.50/x
3. Step 3: Cross multiply
   393,985x = 602,413.50 × 602,413.50
4. Step 4: Simplify right side
   393,985x = 362,902,024,982.25
5. Step 5: Solve for x
   x = 362,902,024,982.25/393,985
6. Step 6: Final answer
   x = 921,106.20