Finding the Third Proportional to 403,667 and 865,290

Step by Step Solution

1. Step 1: Write the proportion equation
   403,667 : 865,290 = 865,290 : x
2. Step 2: Convert to fraction form
   403,667/865,290 = 865,290/x
3. Step 3: Cross multiply
   403,667x = 865,290 × 865,290
4. Step 4: Simplify right side
   403,667x = 748,726,784,100
5. Step 5: Solve for x
   x = 748,726,784,100/403,667
6. Step 6: Final answer
   x = 1,854,812.96