Finding the Third Proportional to 383,431.50 and 806,521.50

Step by Step Solution

1. Step 1: Write the proportion equation
   383,431.50 : 806,521.50 = 806,521.50 : x
2. Step 2: Convert to fraction form
   383,431.50/806,521.50 = 806,521.50/x
3. Step 3: Cross multiply
   383,431.50x = 806,521.50 × 806,521.50
4. Step 4: Simplify right side
   383,431.50x = 650,476,929,962.25
5. Step 5: Solve for x
   x = 650,476,929,962.25/383,431.50
6. Step 6: Final answer
   x = 1,696,461.90