Finding the Third Proportional to 636,640 and 1,381,776

Step by Step Solution

1. Step 1: Write the proportion equation
   636,640 : 1,381,776 = 1,381,776 : x
2. Step 2: Convert to fraction form
   636,640/1,381,776 = 1,381,776/x
3. Step 3: Cross multiply
   636,640x = 1,381,776 × 1,381,776
4. Step 4: Simplify right side
   636,640x = 1,909,304,914,176
5. Step 5: Solve for x
   x = 1,909,304,914,176/636,640
6. Step 6: Final answer
   x = 2,999,033.86