Finding the Third Proportional to 200,808 and 418,248

Step by Step Solution

1. Step 1: Write the proportion equation
   200,808 : 418,248 = 418,248 : x
2. Step 2: Convert to fraction form
   200,808/418,248 = 418,248/x
3. Step 3: Cross multiply
   200,808x = 418,248 × 418,248
4. Step 4: Simplify right side
   200,808x = 174,931,389,504
5. Step 5: Solve for x
   x = 174,931,389,504/200,808
6. Step 6: Final answer
   x = 871,137.55