Finding the Third Proportional to 621,128 and 1,337,360

Step by Step Solution

1. Step 1: Write the proportion equation
   621,128 : 1,337,360 = 1,337,360 : x
2. Step 2: Convert to fraction form
   621,128/1,337,360 = 1,337,360/x
3. Step 3: Cross multiply
   621,128x = 1,337,360 × 1,337,360
4. Step 4: Simplify right side
   621,128x = 1,788,531,769,600
5. Step 5: Solve for x
   x = 1,788,531,769,600/621,128
6. Step 6: Final answer
   x = 2,879,489.85