Finding the Third Proportional to 398,965.50 and 865,749

Step by Step Solution

1. Step 1: Write the proportion equation
   398,965.50 : 865,749 = 865,749 : x
2. Step 2: Convert to fraction form
   398,965.50/865,749 = 865,749/x
3. Step 3: Cross multiply
   398,965.50x = 865,749 × 865,749
4. Step 4: Simplify right side
   398,965.50x = 749,521,331,001
5. Step 5: Solve for x
   x = 749,521,331,001/398,965.50
6. Step 6: Final answer
   x = 1,878,662.02