Finding the Third Proportional to 1,638,840 and 2,570,856

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638,840 : 2,570,856 = 2,570,856 : x
2. Step 2: Convert to fraction form
   1,638,840/2,570,856 = 2,570,856/x
3. Step 3: Cross multiply
   1,638,840x = 2,570,856 × 2,570,856
4. Step 4: Simplify right side
   1,638,840x = 6,609,300,572,736
5. Step 5: Solve for x
   x = 6,609,300,572,736/1,638,840
6. Step 6: Final answer
   x = 4,032,913.87