Finding the Third Proportional to 321,988.50 and 699,300

Step by Step Solution

1. Step 1: Write the proportion equation
   321,988.50 : 699,300 = 699,300 : x
2. Step 2: Convert to fraction form
   321,988.50/699,300 = 699,300/x
3. Step 3: Cross multiply
   321,988.50x = 699,300 × 699,300
4. Step 4: Simplify right side
   321,988.50x = 489,020,490,000
5. Step 5: Solve for x
   x = 489,020,490,000/321,988.50
6. Step 6: Final answer
   x = 1,518,751.42