Finding the Third Proportional to 296,161.75 and 639,606

Step by Step Solution

1. Step 1: Write the proportion equation
   296,161.75 : 639,606 = 639,606 : x
2. Step 2: Convert to fraction form
   296,161.75/639,606 = 639,606/x
3. Step 3: Cross multiply
   296,161.75x = 639,606 × 639,606
4. Step 4: Simplify right side
   296,161.75x = 409,095,835,236
5. Step 5: Solve for x
   x = 409,095,835,236/296,161.75
6. Step 6: Final answer
   x = 1,381,325.70