Finding the Third Proportional to 666,361 and 1,439,109

Step by Step Solution

1. Step 1: Write the proportion equation
   666,361 : 1,439,109 = 1,439,109 : x
2. Step 2: Convert to fraction form
   666,361/1,439,109 = 1,439,109/x
3. Step 3: Cross multiply
   666,361x = 1,439,109 × 1,439,109
4. Step 4: Simplify right side
   666,361x = 2,071,034,713,881
5. Step 5: Solve for x
   x = 2,071,034,713,881/666,361
6. Step 6: Final answer
   x = 3,107,977.08