Finding the Third Proportional to 388,410 and 830,790

Step by Step Solution

1. Step 1: Write the proportion equation
   388,410 : 830,790 = 830,790 : x
2. Step 2: Convert to fraction form
   388,410/830,790 = 830,790/x
3. Step 3: Cross multiply
   388,410x = 830,790 × 830,790
4. Step 4: Simplify right side
   388,410x = 690,212,024,100
5. Step 5: Solve for x
   x = 690,212,024,100/388,410
6. Step 6: Final answer
   x = 1,777,019.19