Finding the Third Proportional to 648,210 and 981,258.75

Step by Step Solution

1. Step 1: Write the proportion equation
   648,210 : 981,258.75 = 981,258.75 : x
2. Step 2: Convert to fraction form
   648,210/981,258.75 = 981,258.75/x
3. Step 3: Cross multiply
   648,210x = 981,258.75 × 981,258.75
4. Step 4: Simplify right side
   648,210x = 962,868,734,451.56
5. Step 5: Solve for x
   x = 962,868,734,451.56/648,210
6. Step 6: Final answer
   x = 1,485,427.15