Finding the Third Proportional to 140,432 and 300,640

Step by Step Solution

1. Step 1: Write the proportion equation
   140,432 : 300,640 = 300,640 : x
2. Step 2: Convert to fraction form
   140,432/300,640 = 300,640/x
3. Step 3: Cross multiply
   140,432x = 300,640 × 300,640
4. Step 4: Simplify right side
   140,432x = 90,384,409,600
5. Step 5: Solve for x
   x = 90,384,409,600/140,432
6. Step 6: Final answer
   x = 643,616.91