Finding the Third Proportional to 640,372 and 1,380,056

Step by Step Solution

1. Step 1: Write the proportion equation
   640,372 : 1,380,056 = 1,380,056 : x
2. Step 2: Convert to fraction form
   640,372/1,380,056 = 1,380,056/x
3. Step 3: Cross multiply
   640,372x = 1,380,056 × 1,380,056
4. Step 4: Simplify right side
   640,372x = 1,904,554,563,136
5. Step 5: Solve for x
   x = 1,904,554,563,136/640,372
6. Step 6: Final answer
   x = 2,974,137.79