Finding the Third Proportional to 642,276 and 1,356,912

Step by Step Solution

1. Step 1: Write the proportion equation
   642,276 : 1,356,912 = 1,356,912 : x
2. Step 2: Convert to fraction form
   642,276/1,356,912 = 1,356,912/x
3. Step 3: Cross multiply
   642,276x = 1,356,912 × 1,356,912
4. Step 4: Simplify right side
   642,276x = 1,841,210,175,744
5. Step 5: Solve for x
   x = 1,841,210,175,744/642,276
6. Step 6: Final answer
   x = 2,866,696.21