Finding the Third Proportional to 621,803 and 1,290,352

Step by Step Solution

1. Step 1: Write the proportion equation
   621,803 : 1,290,352 = 1,290,352 : x
2. Step 2: Convert to fraction form
   621,803/1,290,352 = 1,290,352/x
3. Step 3: Cross multiply
   621,803x = 1,290,352 × 1,290,352
4. Step 4: Simplify right side
   621,803x = 1,665,008,283,904
5. Step 5: Solve for x
   x = 1,665,008,283,904/621,803
6. Step 6: Final answer
   x = 2,677,710.28