Finding the Third Proportional to 590,128.50 and 865,821

Step by Step Solution

1. Step 1: Write the proportion equation
   590,128.50 : 865,821 = 865,821 : x
2. Step 2: Convert to fraction form
   590,128.50/865,821 = 865,821/x
3. Step 3: Cross multiply
   590,128.50x = 865,821 × 865,821
4. Step 4: Simplify right side
   590,128.50x = 749,646,004,041
5. Step 5: Solve for x
   x = 749,646,004,041/590,128.50
6. Step 6: Final answer
   x = 1,270,309.78