Finding the Third Proportional to 1,390,398 and 1,862,253

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,398 : 1,862,253 = 1,862,253 : x
2. Step 2: Convert to fraction form
   1,390,398/1,862,253 = 1,862,253/x
3. Step 3: Cross multiply
   1,390,398x = 1,862,253 × 1,862,253
4. Step 4: Simplify right side
   1,390,398x = 3,467,986,236,009
5. Step 5: Solve for x
   x = 3,467,986,236,009/1,390,398
6. Step 6: Final answer
   x = 2,494,239.95