Finding the Third Proportional to 640,465 and 1,379,898

Step by Step Solution

1. Step 1: Write the proportion equation
   640,465 : 1,379,898 = 1,379,898 : x
2. Step 2: Convert to fraction form
   640,465/1,379,898 = 1,379,898/x
3. Step 3: Cross multiply
   640,465x = 1,379,898 × 1,379,898
4. Step 4: Simplify right side
   640,465x = 1,904,118,490,404
5. Step 5: Solve for x
   x = 1,904,118,490,404/640,465
6. Step 6: Final answer
   x = 2,973,025.05