Finding the Third Proportional to 435,213 and 788,413.50

Step by Step Solution

1. Step 1: Write the proportion equation
   435,213 : 788,413.50 = 788,413.50 : x
2. Step 2: Convert to fraction form
   435,213/788,413.50 = 788,413.50/x
3. Step 3: Cross multiply
   435,213x = 788,413.50 × 788,413.50
4. Step 4: Simplify right side
   435,213x = 621,595,846,982.25
5. Step 5: Solve for x
   x = 621,595,846,982.25/435,213
6. Step 6: Final answer
   x = 1,428,256.62