Finding the Third Proportional to 397,291.50 and 865,512

Step by Step Solution

1. Step 1: Write the proportion equation
   397,291.50 : 865,512 = 865,512 : x
2. Step 2: Convert to fraction form
   397,291.50/865,512 = 865,512/x
3. Step 3: Cross multiply
   397,291.50x = 865,512 × 865,512
4. Step 4: Simplify right side
   397,291.50x = 749,111,022,144
5. Step 5: Solve for x
   x = 749,111,022,144/397,291.50
6. Step 6: Final answer
   x = 1,885,545.05