Finding the Third Proportional to 1,213,445 and 2,638,684

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213,445 : 2,638,684 = 2,638,684 : x
2. Step 2: Convert to fraction form
   1,213,445/2,638,684 = 2,638,684/x
3. Step 3: Cross multiply
   1,213,445x = 2,638,684 × 2,638,684
4. Step 4: Simplify right side
   1,213,445x = 6,962,653,251,856
5. Step 5: Solve for x
   x = 6,962,653,251,856/1,213,445
6. Step 6: Final answer
   x = 5,737,922.40