Finding the Third Proportional to 640,476 and 1,379,916

Step by Step Solution

1. Step 1: Write the proportion equation
   640,476 : 1,379,916 = 1,379,916 : x
2. Step 2: Convert to fraction form
   640,476/1,379,916 = 1,379,916/x
3. Step 3: Cross multiply
   640,476x = 1,379,916 × 1,379,916
4. Step 4: Simplify right side
   640,476x = 1,904,168,167,056
5. Step 5: Solve for x
   x = 1,904,168,167,056/640,476
6. Step 6: Final answer
   x = 2,973,051.55