Finding the Third Proportional to 811,388 and 1,261,308

Step by Step Solution

1. Step 1: Write the proportion equation
   811,388 : 1,261,308 = 1,261,308 : x
2. Step 2: Convert to fraction form
   811,388/1,261,308 = 1,261,308/x
3. Step 3: Cross multiply
   811,388x = 1,261,308 × 1,261,308
4. Step 4: Simplify right side
   811,388x = 1,590,897,870,864
5. Step 5: Solve for x
   x = 1,590,897,870,864/811,388
6. Step 6: Final answer
   x = 1,960,711.61