Finding the Third Proportional to 621,804 and 1,290,354

Step by Step Solution

1. Step 1: Write the proportion equation
   621,804 : 1,290,354 = 1,290,354 : x
2. Step 2: Convert to fraction form
   621,804/1,290,354 = 1,290,354/x
3. Step 3: Cross multiply
   621,804x = 1,290,354 × 1,290,354
4. Step 4: Simplify right side
   621,804x = 1,665,013,445,316
5. Step 5: Solve for x
   x = 1,665,013,445,316/621,804
6. Step 6: Final answer
   x = 2,677,714.27