Finding the Third Proportional to 639,189 and 1,398,654

Step by Step Solution

1. Step 1: Write the proportion equation
   639,189 : 1,398,654 = 1,398,654 : x
2. Step 2: Convert to fraction form
   639,189/1,398,654 = 1,398,654/x
3. Step 3: Cross multiply
   639,189x = 1,398,654 × 1,398,654
4. Step 4: Simplify right side
   639,189x = 1,956,233,011,716
5. Step 5: Solve for x
   x = 1,956,233,011,716/639,189
6. Step 6: Final answer
   x = 3,060,492.30