Finding the Third Proportional to 554,557 and 828,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   554,557 : 828,139.50 = 828,139.50 : x
2. Step 2: Convert to fraction form
   554,557/828,139.50 = 828,139.50/x
3. Step 3: Cross multiply
   554,557x = 828,139.50 × 828,139.50
4. Step 4: Simplify right side
   554,557x = 685,815,031,460.25
5. Step 5: Solve for x
   x = 685,815,031,460.25/554,557
6. Step 6: Final answer
   x = 1,236,689.88