Finding the Third Proportional to 639,172 and 1,398,602

Step by Step Solution

1. Step 1: Write the proportion equation
   639,172 : 1,398,602 = 1,398,602 : x
2. Step 2: Convert to fraction form
   639,172/1,398,602 = 1,398,602/x
3. Step 3: Cross multiply
   639,172x = 1,398,602 × 1,398,602
4. Step 4: Simplify right side
   639,172x = 1,956,087,554,404
5. Step 5: Solve for x
   x = 1,956,087,554,404/639,172
6. Step 6: Final answer
   x = 3,060,346.13