Finding the Third Proportional to 285,248 and 443,648

Step by Step Solution

1. Step 1: Write the proportion equation
   285,248 : 443,648 = 443,648 : x
2. Step 2: Convert to fraction form
   285,248/443,648 = 443,648/x
3. Step 3: Cross multiply
   285,248x = 443,648 × 443,648
4. Step 4: Simplify right side
   285,248x = 196,823,547,904
5. Step 5: Solve for x
   x = 196,823,547,904/285,248
6. Step 6: Final answer
   x = 690,008.51