Finding the Third Proportional to 388,404 and 830,776

Step by Step Solution

1. Step 1: Write the proportion equation
   388,404 : 830,776 = 830,776 : x
2. Step 2: Convert to fraction form
   388,404/830,776 = 830,776/x
3. Step 3: Cross multiply
   388,404x = 830,776 × 830,776
4. Step 4: Simplify right side
   388,404x = 690,188,762,176
5. Step 5: Solve for x
   x = 690,188,762,176/388,404
6. Step 6: Final answer
   x = 1,776,986.75