Finding the Third Proportional to 402,558 and 861,488

Step by Step Solution

1. Step 1: Write the proportion equation
   402,558 : 861,488 = 861,488 : x
2. Step 2: Convert to fraction form
   402,558/861,488 = 861,488/x
3. Step 3: Cross multiply
   402,558x = 861,488 × 861,488
4. Step 4: Simplify right side
   402,558x = 742,161,574,144
5. Step 5: Solve for x
   x = 742,161,574,144/402,558
6. Step 6: Final answer
   x = 1,843,614.02