Finding the Third Proportional to 643,938 and 1,407,540

Step by Step Solution

1. Step 1: Write the proportion equation
   643,938 : 1,407,540 = 1,407,540 : x
2. Step 2: Convert to fraction form
   643,938/1,407,540 = 1,407,540/x
3. Step 3: Cross multiply
   643,938x = 1,407,540 × 1,407,540
4. Step 4: Simplify right side
   643,938x = 1,981,168,851,600
5. Step 5: Solve for x
   x = 1,981,168,851,600/643,938
6. Step 6: Final answer
   x = 3,076,645.35