Finding the Third Proportional to 321,984 and 699,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,984 : 699,322.50 = 699,322.50 : x
2. Step 2: Convert to fraction form
   321,984/699,322.50 = 699,322.50/x
3. Step 3: Cross multiply
   321,984x = 699,322.50 × 699,322.50
4. Step 4: Simplify right side
   321,984x = 489,051,959,006.25
5. Step 5: Solve for x
   x = 489,051,959,006.25/321,984
6. Step 6: Final answer
   x = 1,518,870.38