Finding the Third Proportional to 646,360 and 1,388,672

Step by Step Solution

1. Step 1: Write the proportion equation
   646,360 : 1,388,672 = 1,388,672 : x
2. Step 2: Convert to fraction form
   646,360/1,388,672 = 1,388,672/x
3. Step 3: Cross multiply
   646,360x = 1,388,672 × 1,388,672
4. Step 4: Simplify right side
   646,360x = 1,928,409,923,584
5. Step 5: Solve for x
   x = 1,928,409,923,584/646,360
6. Step 6: Final answer
   x = 2,983,492.05