Finding the Third Proportional to 647,553 and 1,390,257

Step by Step Solution

1. Step 1: Write the proportion equation
   647,553 : 1,390,257 = 1,390,257 : x
2. Step 2: Convert to fraction form
   647,553/1,390,257 = 1,390,257/x
3. Step 3: Cross multiply
   647,553x = 1,390,257 × 1,390,257
4. Step 4: Simplify right side
   647,553x = 1,932,814,526,049
5. Step 5: Solve for x
   x = 1,932,814,526,049/647,553
6. Step 6: Final answer
   x = 2,984,797.42