Finding the Third Proportional to 622,638 and 1,298,377.50

Step by Step Solution

1. Step 1: Write the proportion equation
   622,638 : 1,298,377.50 = 1,298,377.50 : x
2. Step 2: Convert to fraction form
   622,638/1,298,377.50 = 1,298,377.50/x
3. Step 3: Cross multiply
   622,638x = 1,298,377.50 × 1,298,377.50
4. Step 4: Simplify right side
   622,638x = 1,685,784,132,506.25
5. Step 5: Solve for x
   x = 1,685,784,132,506.25/622,638
6. Step 6: Final answer
   x = 2,707,486.75