Finding the Third Proportional to 640,172 and 1,398,460

Step by Step Solution

1. Step 1: Write the proportion equation
   640,172 : 1,398,460 = 1,398,460 : x
2. Step 2: Convert to fraction form
   640,172/1,398,460 = 1,398,460/x
3. Step 3: Cross multiply
   640,172x = 1,398,460 × 1,398,460
4. Step 4: Simplify right side
   640,172x = 1,955,690,371,600
5. Step 5: Solve for x
   x = 1,955,690,371,600/640,172
6. Step 6: Final answer
   x = 3,054,945.19