Finding the Third Proportional to 300,780 and 609,840

Step by Step Solution

1. Step 1: Write the proportion equation
   300,780 : 609,840 = 609,840 : x
2. Step 2: Convert to fraction form
   300,780/609,840 = 609,840/x
3. Step 3: Cross multiply
   300,780x = 609,840 × 609,840
4. Step 4: Simplify right side
   300,780x = 371,904,825,600
5. Step 5: Solve for x
   x = 371,904,825,600/300,780
6. Step 6: Final answer
   x = 1,236,467.94