Finding the Third Proportional to 684,810 and 1,390,356

Step by Step Solution

1. Step 1: Write the proportion equation
   684,810 : 1,390,356 = 1,390,356 : x
2. Step 2: Convert to fraction form
   684,810/1,390,356 = 1,390,356/x
3. Step 3: Cross multiply
   684,810x = 1,390,356 × 1,390,356
4. Step 4: Simplify right side
   684,810x = 1,933,089,806,736
5. Step 5: Solve for x
   x = 1,933,089,806,736/684,810
6. Step 6: Final answer
   x = 2,822,811.88