Finding the Third Proportional to 554,545 and 828,121.50

Step by Step Solution

1. Step 1: Write the proportion equation
   554,545 : 828,121.50 = 828,121.50 : x
2. Step 2: Convert to fraction form
   554,545/828,121.50 = 828,121.50/x
3. Step 3: Cross multiply
   554,545x = 828,121.50 × 828,121.50
4. Step 4: Simplify right side
   554,545x = 685,785,218,762.25
5. Step 5: Solve for x
   x = 685,785,218,762.25/554,545
6. Step 6: Final answer
   x = 1,236,662.88