Finding the Third Proportional to 143,236 and 309,248

Step by Step Solution

1. Step 1: Write the proportion equation
   143,236 : 309,248 = 309,248 : x
2. Step 2: Convert to fraction form
   143,236/309,248 = 309,248/x
3. Step 3: Cross multiply
   143,236x = 309,248 × 309,248
4. Step 4: Simplify right side
   143,236x = 95,634,325,504
5. Step 5: Solve for x
   x = 95,634,325,504/143,236
6. Step 6: Final answer
   x = 667,669.62