Finding the Third Proportional to 640,178 and 1,398,472

Step by Step Solution

1. Step 1: Write the proportion equation
   640,178 : 1,398,472 = 1,398,472 : x
2. Step 2: Convert to fraction form
   640,178/1,398,472 = 1,398,472/x
3. Step 3: Cross multiply
   640,178x = 1,398,472 × 1,398,472
4. Step 4: Simplify right side
   640,178x = 1,955,723,934,784
5. Step 5: Solve for x
   x = 1,955,723,934,784/640,178
6. Step 6: Final answer
   x = 3,054,968.98