Finding the Third Proportional to 388,408 and 830,786

Step by Step Solution

1. Step 1: Write the proportion equation
   388,408 : 830,786 = 830,786 : x
2. Step 2: Convert to fraction form
   388,408/830,786 = 830,786/x
3. Step 3: Cross multiply
   388,408x = 830,786 × 830,786
4. Step 4: Simplify right side
   388,408x = 690,205,377,796
5. Step 5: Solve for x
   x = 690,205,377,796/388,408
6. Step 6: Final answer
   x = 1,777,011.23