Finding the Third Proportional to 775,684 and 1,200,390

Step by Step Solution

1. Step 1: Write the proportion equation
   775,684 : 1,200,390 = 1,200,390 : x
2. Step 2: Convert to fraction form
   775,684/1,200,390 = 1,200,390/x
3. Step 3: Cross multiply
   775,684x = 1,200,390 × 1,200,390
4. Step 4: Simplify right side
   775,684x = 1,440,936,152,100
5. Step 5: Solve for x
   x = 1,440,936,152,100/775,684
6. Step 6: Final answer
   x = 1,857,632.94