Finding the Third Proportional to 415,906.50 and 851,521.50

Step by Step Solution

1. Step 1: Write the proportion equation
   415,906.50 : 851,521.50 = 851,521.50 : x
2. Step 2: Convert to fraction form
   415,906.50/851,521.50 = 851,521.50/x
3. Step 3: Cross multiply
   415,906.50x = 851,521.50 × 851,521.50
4. Step 4: Simplify right side
   415,906.50x = 725,088,864,962.25
5. Step 5: Solve for x
   x = 725,088,864,962.25/415,906.50
6. Step 6: Final answer
   x = 1,743,393.92