Finding the Third Proportional to 866,813 and 1,291,039

Step by Step Solution

1. Step 1: Write the proportion equation
   866,813 : 1,291,039 = 1,291,039 : x
2. Step 2: Convert to fraction form
   866,813/1,291,039 = 1,291,039/x
3. Step 3: Cross multiply
   866,813x = 1,291,039 × 1,291,039
4. Step 4: Simplify right side
   866,813x = 1,666,781,699,521
5. Step 5: Solve for x
   x = 1,666,781,699,521/866,813
6. Step 6: Final answer
   x = 1,922,884.98