Finding the Third Proportional to 646,240 and 1,380,447

Step by Step Solution

1. Step 1: Write the proportion equation
   646,240 : 1,380,447 = 1,380,447 : x
2. Step 2: Convert to fraction form
   646,240/1,380,447 = 1,380,447/x
3. Step 3: Cross multiply
   646,240x = 1,380,447 × 1,380,447
4. Step 4: Simplify right side
   646,240x = 1,905,633,919,809
5. Step 5: Solve for x
   x = 1,905,633,919,809/646,240
6. Step 6: Final answer
   x = 2,948,802.18