Finding the Third Proportional to 554,769 and 855,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   554,769 : 855,661.50 = 855,661.50 : x
2. Step 2: Convert to fraction form
   554,769/855,661.50 = 855,661.50/x
3. Step 3: Cross multiply
   554,769x = 855,661.50 × 855,661.50
4. Step 4: Simplify right side
   554,769x = 732,156,602,582.25
5. Step 5: Solve for x
   x = 732,156,602,582.25/554,769
6. Step 6: Final answer
   x = 1,319,750.39