Finding the Third Proportional to 644,133 and 1,399,256.50

Step by Step Solution

1. Step 1: Write the proportion equation
   644,133 : 1,399,256.50 = 1,399,256.50 : x
2. Step 2: Convert to fraction form
   644,133/1,399,256.50 = 1,399,256.50/x
3. Step 3: Cross multiply
   644,133x = 1,399,256.50 × 1,399,256.50
4. Step 4: Simplify right side
   644,133x = 1,957,918,752,792.25
5. Step 5: Solve for x
   x = 1,957,918,752,792.25/644,133
6. Step 6: Final answer
   x = 3,039,618.76