Finding the Third Proportional to 687,248 and 1,421,636

Step by Step Solution

1. Step 1: Write the proportion equation
   687,248 : 1,421,636 = 1,421,636 : x
2. Step 2: Convert to fraction form
   687,248/1,421,636 = 1,421,636/x
3. Step 3: Cross multiply
   687,248x = 1,421,636 × 1,421,636
4. Step 4: Simplify right side
   687,248x = 2,021,048,916,496
5. Step 5: Solve for x
   x = 2,021,048,916,496/687,248
6. Step 6: Final answer
   x = 2,940,785.45