Finding the Third Proportional to 200,855.50 and 418,357

Step by Step Solution

1. Step 1: Write the proportion equation
   200,855.50 : 418,357 = 418,357 : x
2. Step 2: Convert to fraction form
   200,855.50/418,357 = 418,357/x
3. Step 3: Cross multiply
   200,855.50x = 418,357 × 418,357
4. Step 4: Simplify right side
   200,855.50x = 175,022,579,449
5. Step 5: Solve for x
   x = 175,022,579,449/200,855.50
6. Step 6: Final answer
   x = 871,385.55