Finding the Third Proportional to 648,256 and 981,328

Step by Step Solution

1. Step 1: Write the proportion equation
   648,256 : 981,328 = 981,328 : x
2. Step 2: Convert to fraction form
   648,256/981,328 = 981,328/x
3. Step 3: Cross multiply
   648,256x = 981,328 × 981,328
4. Step 4: Simplify right side
   648,256x = 963,004,643,584
5. Step 5: Solve for x
   x = 963,004,643,584/648,256
6. Step 6: Final answer
   x = 1,485,531.40