Finding the Third Proportional to 640,274 and 1,389,076

Step by Step Solution

1. Step 1: Write the proportion equation
   640,274 : 1,389,076 = 1,389,076 : x
2. Step 2: Convert to fraction form
   640,274/1,389,076 = 1,389,076/x
3. Step 3: Cross multiply
   640,274x = 1,389,076 × 1,389,076
4. Step 4: Simplify right side
   640,274x = 1,929,532,133,776
5. Step 5: Solve for x
   x = 1,929,532,133,776/640,274
6. Step 6: Final answer
   x = 3,013,603.76